diff --git a/src/main/gnome-shell/gdm3-dark.css b/src/main/gnome-shell/gdm3-dark.css
index 26ef4f9..e5b465b 100644
--- a/src/main/gnome-shell/gdm3-dark.css
+++ b/src/main/gnome-shell/gdm3-dark.css
@@ -62,7 +62,7 @@ stage {
   box-shadow: none;
 }
 
-.candidate-popup-boxpointer, .popup-menu .popup-menu-content {
+.candidate-popup-content, .popup-menu .popup-menu-content {
   background-color: rgba(36, 36, 36, 0.95);
   border-radius: 12px;
   box-shadow: inset 0 0 1px 0 rgba(255, 255, 255, 0.2);
@@ -559,7 +559,7 @@ stage {
 }
 
 .message {
-  margin: 2px 4px 6px;
+  margin: 0 4px;
 }
 
 .message:first-child {
@@ -1626,16 +1626,6 @@ StEntry StLabel.hint-text {
   selected-color: #0860F2;
 }
 
-.candidate-popup-boxpointer {
-  -arrow-border-radius: 2px;
-  -arrow-background-color: rgba(36, 36, 36, 0.95);
-  -arrow-border-width: 0;
-  -arrow-border-color: transparent;
-  -arrow-base: 5px;
-  -arrow-rise: 5px;
-  background-color: transparent;
-}
-
 .popup-separator-menu-item {
   margin: 0 0;
   padding: 0 0;
@@ -1747,7 +1737,19 @@ StEntry StLabel.hint-text {
   background-color: #0860F2;
 }
 
+.candidate-popup-boxpointer {
+  -arrow-border-radius: 2px;
+  -arrow-background-color: transparent;
+  -arrow-border-width: 0;
+  -arrow-border-color: transparent;
+  -arrow-base: 64px;
+  -arrow-rise: 12px;
+  background-color: transparent;
+}
+
 .candidate-popup-content {
+  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.25);
+  border: 1px solid rgba(0, 0, 0, 0.75);
   padding: 8px;
   spacing: 0;
 }
@@ -1765,6 +1767,7 @@ StEntry StLabel.hint-text {
   transition-duration: 0ms;
   min-height: 28px;
   padding: 0 8px;
+  margin-right: 2px;
   border-radius: 6px;
 }
 
diff --git a/src/main/gnome-shell/gdm3-light.css b/src/main/gnome-shell/gdm3-light.css
index 679dd30..c33697b 100644
--- a/src/main/gnome-shell/gdm3-light.css
+++ b/src/main/gnome-shell/gdm3-light.css
@@ -62,7 +62,7 @@ stage {
   box-shadow: none;
 }
 
-.candidate-popup-boxpointer, .popup-menu .popup-menu-content {
+.candidate-popup-content, .popup-menu .popup-menu-content {
   background-color: rgba(245, 245, 245, 0.95);
   border-radius: 12px;
   box-shadow: inset 0 0 1px 0 rgba(255, 255, 255, 0.2);
@@ -559,7 +559,7 @@ stage {
 }
 
 .message {
-  margin: 2px 4px 6px;
+  margin: 0 4px;
 }
 
 .message:first-child {
@@ -1626,16 +1626,6 @@ StEntry StLabel.hint-text {
   selected-color: #0860F2;
 }
 
-.candidate-popup-boxpointer {
-  -arrow-border-radius: 2px;
-  -arrow-background-color: rgba(245, 245, 245, 0.95);
-  -arrow-border-width: 0;
-  -arrow-border-color: transparent;
-  -arrow-base: 5px;
-  -arrow-rise: 5px;
-  background-color: transparent;
-}
-
 .popup-separator-menu-item {
   margin: 0 0;
   padding: 0 0;
@@ -1747,7 +1737,19 @@ StEntry StLabel.hint-text {
   background-color: #0860F2;
 }
 
+.candidate-popup-boxpointer {
+  -arrow-border-radius: 2px;
+  -arrow-background-color: transparent;
+  -arrow-border-width: 0;
+  -arrow-border-color: transparent;
+  -arrow-base: 64px;
+  -arrow-rise: 12px;
+  background-color: transparent;
+}
+
 .candidate-popup-content {
+  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.25);
+  border: 1px solid rgba(0, 0, 0, 0);
   padding: 8px;
   spacing: 0;
 }
@@ -1765,6 +1767,7 @@ StEntry StLabel.hint-text {
   transition-duration: 0ms;
   min-height: 28px;
   padding: 0 8px;
+  margin-right: 2px;
   border-radius: 6px;
 }
 
diff --git a/src/main/gnome-shell/gnome-shell-dark-solid.css b/src/main/gnome-shell/gnome-shell-dark-solid.css
index 1d38bed..0ef4e52 100644
--- a/src/main/gnome-shell/gnome-shell-dark-solid.css
+++ b/src/main/gnome-shell/gnome-shell-dark-solid.css
@@ -157,7 +157,7 @@ stage {
   border-radius: 0 0 6px 6px;
 }
 
-.candidate-popup-boxpointer, .popup-menu .popup-menu-content, .modal-dialog {
+.candidate-popup-content, .popup-menu .popup-menu-content, .modal-dialog {
   background-color: #242424;
   border-radius: 12px;
   box-shadow: inset 0 0 1px 0 rgba(255, 255, 255, 0.2);
@@ -654,7 +654,7 @@ stage {
 }
 
 .message {
-  margin: 2px 4px 6px;
+  margin: 0 4px;
 }
 
 .message:first-child {
@@ -3293,16 +3293,6 @@ StEntry StLabel.hint-text {
   selected-color: #0860F2;
 }
 
-.candidate-popup-boxpointer {
-  -arrow-border-radius: 2px;
-  -arrow-background-color: #242424;
-  -arrow-border-width: 0;
-  -arrow-border-color: transparent;
-  -arrow-base: 5px;
-  -arrow-rise: 5px;
-  background-color: transparent;
-}
-
 .popup-separator-menu-item {
   margin: 0 0;
   padding: 0 0;
@@ -3414,7 +3404,19 @@ StEntry StLabel.hint-text {
   background-color: #0860F2;
 }
 
+.candidate-popup-boxpointer {
+  -arrow-border-radius: 2px;
+  -arrow-background-color: transparent;
+  -arrow-border-width: 0;
+  -arrow-border-color: transparent;
+  -arrow-base: 64px;
+  -arrow-rise: 12px;
+  background-color: transparent;
+}
+
 .candidate-popup-content {
+  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.25);
+  border: 1px solid rgba(0, 0, 0, 0.75);
   padding: 8px;
   spacing: 0;
 }
@@ -3432,6 +3434,7 @@ StEntry StLabel.hint-text {
   transition-duration: 0ms;
   min-height: 28px;
   padding: 0 8px;
+  margin-right: 2px;
   border-radius: 6px;
 }
 
diff --git a/src/main/gnome-shell/gnome-shell-dark.css b/src/main/gnome-shell/gnome-shell-dark.css
index 80b11b3..df10a1d 100644
--- a/src/main/gnome-shell/gnome-shell-dark.css
+++ b/src/main/gnome-shell/gnome-shell-dark.css
@@ -157,7 +157,7 @@ stage {
   border-radius: 0 0 6px 6px;
 }
 
-.candidate-popup-boxpointer, .popup-menu .popup-menu-content, .modal-dialog {
+.candidate-popup-content, .popup-menu .popup-menu-content, .modal-dialog {
   background-color: rgba(36, 36, 36, 0.95);
   border-radius: 12px;
   box-shadow: inset 0 0 1px 0 rgba(255, 255, 255, 0.2);
@@ -654,7 +654,7 @@ stage {
 }
 
 .message {
-  margin: 2px 4px 6px;
+  margin: 0 4px;
 }
 
 .message:first-child {
@@ -3293,16 +3293,6 @@ StEntry StLabel.hint-text {
   selected-color: #0860F2;
 }
 
-.candidate-popup-boxpointer {
-  -arrow-border-radius: 2px;
-  -arrow-background-color: rgba(36, 36, 36, 0.95);
-  -arrow-border-width: 0;
-  -arrow-border-color: transparent;
-  -arrow-base: 5px;
-  -arrow-rise: 5px;
-  background-color: transparent;
-}
-
 .popup-separator-menu-item {
   margin: 0 0;
   padding: 0 0;
@@ -3414,7 +3404,19 @@ StEntry StLabel.hint-text {
   background-color: #0860F2;
 }
 
+.candidate-popup-boxpointer {
+  -arrow-border-radius: 2px;
+  -arrow-background-color: transparent;
+  -arrow-border-width: 0;
+  -arrow-border-color: transparent;
+  -arrow-base: 64px;
+  -arrow-rise: 12px;
+  background-color: transparent;
+}
+
 .candidate-popup-content {
+  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.25);
+  border: 1px solid rgba(0, 0, 0, 0.75);
   padding: 8px;
   spacing: 0;
 }
@@ -3432,6 +3434,7 @@ StEntry StLabel.hint-text {
   transition-duration: 0ms;
   min-height: 28px;
   padding: 0 8px;
+  margin-right: 2px;
   border-radius: 6px;
 }
 
diff --git a/src/main/gnome-shell/gnome-shell-light-solid.css b/src/main/gnome-shell/gnome-shell-light-solid.css
index 7a8f399..889075d 100644
--- a/src/main/gnome-shell/gnome-shell-light-solid.css
+++ b/src/main/gnome-shell/gnome-shell-light-solid.css
@@ -157,7 +157,7 @@ stage {
   border-radius: 0 0 6px 6px;
 }
 
-.candidate-popup-boxpointer, .popup-menu .popup-menu-content, .modal-dialog {
+.candidate-popup-content, .popup-menu .popup-menu-content, .modal-dialog {
   background-color: #f5f5f5;
   border-radius: 12px;
   box-shadow: inset 0 0 1px 0 rgba(255, 255, 255, 0.2);
@@ -654,7 +654,7 @@ stage {
 }
 
 .message {
-  margin: 2px 4px 6px;
+  margin: 0 4px;
 }
 
 .message:first-child {
@@ -3297,16 +3297,6 @@ StEntry StLabel.hint-text {
   selected-color: #0860F2;
 }
 
-.candidate-popup-boxpointer {
-  -arrow-border-radius: 2px;
-  -arrow-background-color: #f5f5f5;
-  -arrow-border-width: 0;
-  -arrow-border-color: transparent;
-  -arrow-base: 5px;
-  -arrow-rise: 5px;
-  background-color: transparent;
-}
-
 .popup-separator-menu-item {
   margin: 0 0;
   padding: 0 0;
@@ -3418,7 +3408,19 @@ StEntry StLabel.hint-text {
   background-color: #0860F2;
 }
 
+.candidate-popup-boxpointer {
+  -arrow-border-radius: 2px;
+  -arrow-background-color: transparent;
+  -arrow-border-width: 0;
+  -arrow-border-color: transparent;
+  -arrow-base: 64px;
+  -arrow-rise: 12px;
+  background-color: transparent;
+}
+
 .candidate-popup-content {
+  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.25);
+  border: 1px solid rgba(0, 0, 0, 0);
   padding: 8px;
   spacing: 0;
 }
@@ -3436,6 +3438,7 @@ StEntry StLabel.hint-text {
   transition-duration: 0ms;
   min-height: 28px;
   padding: 0 8px;
+  margin-right: 2px;
   border-radius: 6px;
 }
 
diff --git a/src/main/gnome-shell/gnome-shell-light.css b/src/main/gnome-shell/gnome-shell-light.css
index 307213d..26ed0b6 100644
--- a/src/main/gnome-shell/gnome-shell-light.css
+++ b/src/main/gnome-shell/gnome-shell-light.css
@@ -157,7 +157,7 @@ stage {
   border-radius: 0 0 6px 6px;
 }
 
-.candidate-popup-boxpointer, .popup-menu .popup-menu-content, .modal-dialog {
+.candidate-popup-content, .popup-menu .popup-menu-content, .modal-dialog {
   background-color: rgba(245, 245, 245, 0.95);
   border-radius: 12px;
   box-shadow: inset 0 0 1px 0 rgba(255, 255, 255, 0.2);
@@ -654,7 +654,7 @@ stage {
 }
 
 .message {
-  margin: 2px 4px 6px;
+  margin: 0 4px;
 }
 
 .message:first-child {
@@ -3293,16 +3293,6 @@ StEntry StLabel.hint-text {
   selected-color: #0860F2;
 }
 
-.candidate-popup-boxpointer {
-  -arrow-border-radius: 2px;
-  -arrow-background-color: rgba(245, 245, 245, 0.95);
-  -arrow-border-width: 0;
-  -arrow-border-color: transparent;
-  -arrow-base: 5px;
-  -arrow-rise: 5px;
-  background-color: transparent;
-}
-
 .popup-separator-menu-item {
   margin: 0 0;
   padding: 0 0;
@@ -3414,7 +3404,19 @@ StEntry StLabel.hint-text {
   background-color: #0860F2;
 }
 
+.candidate-popup-boxpointer {
+  -arrow-border-radius: 2px;
+  -arrow-background-color: transparent;
+  -arrow-border-width: 0;
+  -arrow-border-color: transparent;
+  -arrow-base: 64px;
+  -arrow-rise: 12px;
+  background-color: transparent;
+}
+
 .candidate-popup-content {
+  box-shadow: 0 8px 16px 0 rgba(0, 0, 0, 0.25);
+  border: 1px solid rgba(0, 0, 0, 0);
   padding: 8px;
   spacing: 0;
 }
@@ -3432,6 +3434,7 @@ StEntry StLabel.hint-text {
   transition-duration: 0ms;
   min-height: 28px;
   padding: 0 8px;
+  margin-right: 2px;
   border-radius: 6px;
 }
 
diff --git a/src/main/gtk-3.0/gtk-dark-blue.css b/src/main/gtk-3.0/gtk-dark-blue.css
index 20807b5..cc4fe74 100644
--- a/src/main/gtk-3.0/gtk-dark-blue.css
+++ b/src/main/gtk-3.0/gtk-dark-blue.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5062,6 +5090,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5321,6 +5361,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5923,12 +5967,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5938,60 +5982,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-green.css b/src/main/gtk-3.0/gtk-dark-green.css
index 57eb81c..6ef18be 100644
--- a/src/main/gtk-3.0/gtk-dark-green.css
+++ b/src/main/gtk-3.0/gtk-dark-green.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5062,6 +5090,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5321,6 +5361,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5923,12 +5967,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5938,60 +5982,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-grey.css b/src/main/gtk-3.0/gtk-dark-grey.css
index bdfc66a..133054d 100644
--- a/src/main/gtk-3.0/gtk-dark-grey.css
+++ b/src/main/gtk-3.0/gtk-dark-grey.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5062,6 +5090,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5321,6 +5361,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5923,12 +5967,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5938,60 +5982,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-orange.css b/src/main/gtk-3.0/gtk-dark-orange.css
index 38fed5d..d805cb2 100644
--- a/src/main/gtk-3.0/gtk-dark-orange.css
+++ b/src/main/gtk-3.0/gtk-dark-orange.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5062,6 +5090,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5321,6 +5361,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5923,12 +5967,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5938,60 +5982,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-pink.css b/src/main/gtk-3.0/gtk-dark-pink.css
index 2f2d3e1..ed01211 100644
--- a/src/main/gtk-3.0/gtk-dark-pink.css
+++ b/src/main/gtk-3.0/gtk-dark-pink.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5062,6 +5090,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5321,6 +5361,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5923,12 +5967,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5938,60 +5982,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-purple.css b/src/main/gtk-3.0/gtk-dark-purple.css
index 550c13e..aea4c45 100644
--- a/src/main/gtk-3.0/gtk-dark-purple.css
+++ b/src/main/gtk-3.0/gtk-dark-purple.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5062,6 +5090,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5321,6 +5361,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5923,12 +5967,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5938,60 +5982,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-red.css b/src/main/gtk-3.0/gtk-dark-red.css
index e52c678..13bd1fb 100644
--- a/src/main/gtk-3.0/gtk-dark-red.css
+++ b/src/main/gtk-3.0/gtk-dark-red.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5062,6 +5090,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5321,6 +5361,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5923,12 +5967,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5938,60 +5982,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-solid-blue.css b/src/main/gtk-3.0/gtk-dark-solid-blue.css
index 394ddf9..db4ee2c 100644
--- a/src/main/gtk-3.0/gtk-dark-solid-blue.css
+++ b/src/main/gtk-3.0/gtk-dark-solid-blue.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5066,6 +5094,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5325,6 +5365,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5927,12 +5971,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5942,60 +5986,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-solid-green.css b/src/main/gtk-3.0/gtk-dark-solid-green.css
index 098deb5..a713079 100644
--- a/src/main/gtk-3.0/gtk-dark-solid-green.css
+++ b/src/main/gtk-3.0/gtk-dark-solid-green.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5066,6 +5094,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5325,6 +5365,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5927,12 +5971,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5942,60 +5986,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-solid-grey.css b/src/main/gtk-3.0/gtk-dark-solid-grey.css
index ee7ce4b..7af7370 100644
--- a/src/main/gtk-3.0/gtk-dark-solid-grey.css
+++ b/src/main/gtk-3.0/gtk-dark-solid-grey.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5066,6 +5094,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5325,6 +5365,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5927,12 +5971,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5942,60 +5986,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-solid-orange.css b/src/main/gtk-3.0/gtk-dark-solid-orange.css
index 31bc506..9165361 100644
--- a/src/main/gtk-3.0/gtk-dark-solid-orange.css
+++ b/src/main/gtk-3.0/gtk-dark-solid-orange.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5066,6 +5094,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5325,6 +5365,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5927,12 +5971,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5942,60 +5986,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-solid-pink.css b/src/main/gtk-3.0/gtk-dark-solid-pink.css
index 3d8f32a..6154855 100644
--- a/src/main/gtk-3.0/gtk-dark-solid-pink.css
+++ b/src/main/gtk-3.0/gtk-dark-solid-pink.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5066,6 +5094,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5325,6 +5365,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5927,12 +5971,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5942,60 +5986,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-solid-purple.css b/src/main/gtk-3.0/gtk-dark-solid-purple.css
index 44e9d07..9c0fcb3 100644
--- a/src/main/gtk-3.0/gtk-dark-solid-purple.css
+++ b/src/main/gtk-3.0/gtk-dark-solid-purple.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5066,6 +5094,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5325,6 +5365,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5927,12 +5971,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5942,60 +5986,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-solid-red.css b/src/main/gtk-3.0/gtk-dark-solid-red.css
index 2b3eb0a..e06eff5 100644
--- a/src/main/gtk-3.0/gtk-dark-solid-red.css
+++ b/src/main/gtk-3.0/gtk-dark-solid-red.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5066,6 +5094,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5325,6 +5365,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5927,12 +5971,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5942,60 +5986,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-solid-yellow.css b/src/main/gtk-3.0/gtk-dark-solid-yellow.css
index 0d8ea77..640376b 100644
--- a/src/main/gtk-3.0/gtk-dark-solid-yellow.css
+++ b/src/main/gtk-3.0/gtk-dark-solid-yellow.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5066,6 +5094,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5325,6 +5365,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5927,12 +5971,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5942,60 +5986,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-solid.css b/src/main/gtk-3.0/gtk-dark-solid.css
index 138f067..c9f9924 100644
--- a/src/main/gtk-3.0/gtk-dark-solid.css
+++ b/src/main/gtk-3.0/gtk-dark-solid.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5066,6 +5094,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5325,6 +5365,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5927,12 +5971,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5942,60 +5986,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark-yellow.css b/src/main/gtk-3.0/gtk-dark-yellow.css
index e5eb66c..d1eea9c 100644
--- a/src/main/gtk-3.0/gtk-dark-yellow.css
+++ b/src/main/gtk-3.0/gtk-dark-yellow.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5062,6 +5090,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5321,6 +5361,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5923,12 +5967,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5938,60 +5982,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-dark.css b/src/main/gtk-3.0/gtk-dark.css
index 5b78bd5..59ae942 100644
--- a/src/main/gtk-3.0/gtk-dark.css
+++ b/src/main/gtk-3.0/gtk-dark.css
@@ -1641,6 +1641,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1681,10 +1682,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1703,6 +1712,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1717,10 +1731,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.1);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4550,6 +4569,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
@@ -4568,6 +4588,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.35), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.1), 0 0 0 1px rgba(0, 0, 0, 0.75);
@@ -4808,6 +4832,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5062,6 +5090,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5321,6 +5361,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #242424;
@@ -5923,12 +5967,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #333333;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #0e0e0e;
 }
 
@@ -5938,60 +5982,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#0e0e0e);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(255, 255, 255, 0.03), inset 0 0 3px rgba(255, 255, 255, 0.02), inset 0 0 0 1px rgba(255, 255, 255, 0.04), inset 0 1px rgba(255, 255, 255, 0.06);
   background-color: rgba(255, 255, 255, 0.05);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-blue.css b/src/main/gtk-3.0/gtk-light-blue.css
index 7943a9b..80496a0 100644
--- a/src/main/gtk-3.0/gtk-light-blue.css
+++ b/src/main/gtk-3.0/gtk-light-blue.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5084,6 +5112,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5343,6 +5383,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5946,12 +5990,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5961,60 +6005,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-green.css b/src/main/gtk-3.0/gtk-light-green.css
index b5cb358..40e1210 100644
--- a/src/main/gtk-3.0/gtk-light-green.css
+++ b/src/main/gtk-3.0/gtk-light-green.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5084,6 +5112,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5343,6 +5383,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5946,12 +5990,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5961,60 +6005,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-grey.css b/src/main/gtk-3.0/gtk-light-grey.css
index c8d7138..929ad45 100644
--- a/src/main/gtk-3.0/gtk-light-grey.css
+++ b/src/main/gtk-3.0/gtk-light-grey.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5084,6 +5112,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5343,6 +5383,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5946,12 +5990,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5961,60 +6005,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-orange.css b/src/main/gtk-3.0/gtk-light-orange.css
index 48a0d90..14b8c73 100644
--- a/src/main/gtk-3.0/gtk-light-orange.css
+++ b/src/main/gtk-3.0/gtk-light-orange.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5084,6 +5112,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5343,6 +5383,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5946,12 +5990,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5961,60 +6005,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-pink.css b/src/main/gtk-3.0/gtk-light-pink.css
index ce18306..ddbfb17 100644
--- a/src/main/gtk-3.0/gtk-light-pink.css
+++ b/src/main/gtk-3.0/gtk-light-pink.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5084,6 +5112,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5343,6 +5383,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5946,12 +5990,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5961,60 +6005,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-purple.css b/src/main/gtk-3.0/gtk-light-purple.css
index fe0c9c7..e9b2906 100644
--- a/src/main/gtk-3.0/gtk-light-purple.css
+++ b/src/main/gtk-3.0/gtk-light-purple.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5084,6 +5112,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5343,6 +5383,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5946,12 +5990,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5961,60 +6005,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-red.css b/src/main/gtk-3.0/gtk-light-red.css
index f2fb13b..9b8e098 100644
--- a/src/main/gtk-3.0/gtk-light-red.css
+++ b/src/main/gtk-3.0/gtk-light-red.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5084,6 +5112,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5343,6 +5383,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5946,12 +5990,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5961,60 +6005,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-solid-blue.css b/src/main/gtk-3.0/gtk-light-solid-blue.css
index 1fea613..1b0e8e7 100644
--- a/src/main/gtk-3.0/gtk-light-solid-blue.css
+++ b/src/main/gtk-3.0/gtk-light-solid-blue.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5088,6 +5116,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5347,6 +5387,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5950,12 +5994,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5965,60 +6009,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-solid-green.css b/src/main/gtk-3.0/gtk-light-solid-green.css
index 874b42e..741c509 100644
--- a/src/main/gtk-3.0/gtk-light-solid-green.css
+++ b/src/main/gtk-3.0/gtk-light-solid-green.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5088,6 +5116,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5347,6 +5387,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5950,12 +5994,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5965,60 +6009,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-solid-grey.css b/src/main/gtk-3.0/gtk-light-solid-grey.css
index b2b3b53..6e282c3 100644
--- a/src/main/gtk-3.0/gtk-light-solid-grey.css
+++ b/src/main/gtk-3.0/gtk-light-solid-grey.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5088,6 +5116,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5347,6 +5387,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5950,12 +5994,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5965,60 +6009,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-solid-orange.css b/src/main/gtk-3.0/gtk-light-solid-orange.css
index 006edd9..6d39841 100644
--- a/src/main/gtk-3.0/gtk-light-solid-orange.css
+++ b/src/main/gtk-3.0/gtk-light-solid-orange.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5088,6 +5116,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5347,6 +5387,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5950,12 +5994,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5965,60 +6009,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-solid-pink.css b/src/main/gtk-3.0/gtk-light-solid-pink.css
index e85eb6a..ef31194 100644
--- a/src/main/gtk-3.0/gtk-light-solid-pink.css
+++ b/src/main/gtk-3.0/gtk-light-solid-pink.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5088,6 +5116,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5347,6 +5387,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5950,12 +5994,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5965,60 +6009,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-solid-purple.css b/src/main/gtk-3.0/gtk-light-solid-purple.css
index e1deb9d..f5ddfb2 100644
--- a/src/main/gtk-3.0/gtk-light-solid-purple.css
+++ b/src/main/gtk-3.0/gtk-light-solid-purple.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5088,6 +5116,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5347,6 +5387,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5950,12 +5994,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5965,60 +6009,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-solid-red.css b/src/main/gtk-3.0/gtk-light-solid-red.css
index 1a25ed3..dda6032 100644
--- a/src/main/gtk-3.0/gtk-light-solid-red.css
+++ b/src/main/gtk-3.0/gtk-light-solid-red.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5088,6 +5116,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5347,6 +5387,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5950,12 +5994,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5965,60 +6009,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-solid-yellow.css b/src/main/gtk-3.0/gtk-light-solid-yellow.css
index 5da88b2..187e658 100644
--- a/src/main/gtk-3.0/gtk-light-solid-yellow.css
+++ b/src/main/gtk-3.0/gtk-light-solid-yellow.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5088,6 +5116,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5347,6 +5387,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5950,12 +5994,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5965,60 +6009,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-solid.css b/src/main/gtk-3.0/gtk-light-solid.css
index 4e1a9fc..9c2d8cb 100644
--- a/src/main/gtk-3.0/gtk-light-solid.css
+++ b/src/main/gtk-3.0/gtk-light-solid.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5088,6 +5116,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5347,6 +5387,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5950,12 +5994,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5965,60 +6009,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light-yellow.css b/src/main/gtk-3.0/gtk-light-yellow.css
index 2bbb8f3..155c514 100644
--- a/src/main/gtk-3.0/gtk-light-yellow.css
+++ b/src/main/gtk-3.0/gtk-light-yellow.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5084,6 +5112,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5343,6 +5383,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5946,12 +5990,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5961,60 +6005,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/main/gtk-3.0/gtk-light.css b/src/main/gtk-3.0/gtk-light.css
index da53a4d..4d5eb0e 100644
--- a/src/main/gtk-3.0/gtk-light.css
+++ b/src/main/gtk-3.0/gtk-light.css
@@ -1649,6 +1649,7 @@ headerbar.titlebar headerbar:not(.titlebar) {
 }
 
 .tiled headerbar, .tiled headerbar:backdrop, .maximized headerbar, .maximized headerbar:backdrop {
+  border-radius: 0 0 0 0;
   box-shadow: none;
 }
 
@@ -1689,10 +1690,18 @@ separator:first-child + headerbar, separator:first-child + headerbar:backdrop, h
   border-top-left-radius: 12px;
 }
 
+.maximized separator:first-child + headerbar, .tiled separator:first-child + headerbar, .maximized separator:first-child + headerbar:backdrop, .tiled separator:first-child + headerbar:backdrop, .maximized headerbar:first-child, .tiled headerbar:first-child, .maximized headerbar:first-child:backdrop, .tiled headerbar:first-child:backdrop {
+  border-top-left-radius: 0;
+}
+
 headerbar:last-child, headerbar:last-child:backdrop {
   border-top-right-radius: 12px;
 }
 
+.maximized headerbar:last-child, .tiled headerbar:last-child, .maximized headerbar:last-child:backdrop, .tiled headerbar:last-child:backdrop {
+  border-top-right-radius: 0;
+}
+
 stack headerbar:first-child, stack headerbar:last-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
@@ -1711,6 +1720,11 @@ window stack headerbar:first-child:backdrop, window stack headerbar:first-child,
   border-top-right-radius: 12px;
 }
 
+window.tiled headerbar, window.tiled headerbar:first-child, window.tiled headerbar:last-child, window.tiled headerbar:only-child, window.tiled-top headerbar, window.tiled-top headerbar:first-child, window.tiled-top headerbar:last-child, window.tiled-top headerbar:only-child, window.tiled-right headerbar, window.tiled-right headerbar:first-child, window.tiled-right headerbar:last-child, window.tiled-right headerbar:only-child, window.tiled-bottom headerbar, window.tiled-bottom headerbar:first-child, window.tiled-bottom headerbar:last-child, window.tiled-bottom headerbar:only-child, window.tiled-left headerbar, window.tiled-left headerbar:first-child, window.tiled-left headerbar:last-child, window.tiled-left headerbar:only-child, window.maximized headerbar, window.maximized headerbar:first-child, window.maximized headerbar:last-child, window.maximized headerbar:only-child {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.fullscreen headerbar:last-child, window.fullscreen headerbar:only-child, .solid-csd headerbar, .solid-csd headerbar:first-child, .solid-csd headerbar:last-child, .solid-csd headerbar:only-child {
   border-top-left-radius: 0;
   border-top-right-radius: 0;
@@ -1725,10 +1739,15 @@ window.fullscreen headerbar, window.fullscreen headerbar:first-child, window.ful
   box-shadow: inset 0 1px rgba(255, 255, 255, 0.65);
 }
 
-.fullscreen .titlebar, .fullscreen .titlebar headerbar {
+.tiled .titlebar, .maximized .titlebar, .fullscreen .titlebar, .tiled .titlebar headerbar, .maximized .titlebar headerbar, .fullscreen .titlebar headerbar {
   box-shadow: none;
 }
 
+.tiled .titlebar, .tiled .titlebar.background, .maximized .titlebar, .maximized .titlebar.background, .fullscreen .titlebar, .fullscreen .titlebar.background, .tiled .titlebar headerbar, .tiled .titlebar headerbar.background, .maximized .titlebar headerbar, .maximized .titlebar headerbar.background, .fullscreen .titlebar headerbar, .fullscreen .titlebar headerbar.background {
+  border-top-left-radius: 0;
+  border-top-right-radius: 0;
+}
+
 .titlebar > box.left.horizontal,
 .titlebar > box.right.horizontal {
   padding: 0 6px;
@@ -4572,6 +4591,7 @@ decoration:backdrop {
 }
 
 .maximized decoration, .fullscreen decoration, .tiled decoration, .tiled-top decoration, .tiled-right decoration, .tiled-bottom decoration, .tiled-left decoration {
+  border-radius: 0;
   box-shadow: 0 3px 3px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
@@ -4590,6 +4610,10 @@ decoration:backdrop {
   box-shadow: 0 0 5px 0 rgba(0, 0, 0, 0.15), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
 }
 
+.ssd decoration.maximized {
+  border-radius: 0 0 0 0;
+}
+
 .csd.popup decoration {
   border-radius: 10px;
   box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), 0 0 0 2px rgba(0, 0, 0, 0.03), 0 0 0 1px rgba(0, 0, 0, 0.12);
@@ -4830,6 +4854,10 @@ terminal-window notebook button.flat.toggle.popup {
   margin: -2px;
 }
 
+terminal-window.background.csd.maximized {
+  border-radius: 0 0 0 0;
+}
+
 window.background.csd > box.vertical > box.horizontal > frame > border {
   border-width: 0 1px 0 0;
 }
@@ -5084,6 +5112,18 @@ window.background.csd > box.vertical > box.horizontal > stack > widget > noteboo
   -gtk-icon-shadow: none;
 }
 
+.nautilus-window.maximized notebook, .nautilus-window.maximized notebook > stack {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized headerbar {
+  border-radius: 0 0 0 0;
+}
+
+.nautilus-window.maximized placessidebar {
+  border-bottom-left-radius: 0;
+}
+
 .nautilus-window placesview row.activatable {
   border-radius: 6px;
   margin-right: 6px;
@@ -5343,6 +5383,10 @@ window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned s
   background: none;
 }
 
+.tiled window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .maximized window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow, .fullscreen window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > box.vertical > stack > grid.horizontal > scrolledwindow {
+  border-bottom-left-radius: 0;
+}
+
 .open-document-selector-treeview.view {
   padding: 3px 6px 3px 6px;
   border-color: #ffffff;
@@ -5946,12 +5990,12 @@ window.background.csd > headerbar.titlebar > leaflet > headerbar:last-child, win
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar, window.background.csd > hdyleaflet > box.vertical > searchbar, window.background.csd > leaflet > box.vertical > searchbar, window.background.csd > box.horizontal > box.vertical > searchbar {
   background-color: #f0f0f0;
 }
 
 .geary-main-window.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box,
-window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box {
+window#GearyMainWindow.background.csd > overlay > box.vertical > paned > .sidebar > searchbar > revealer > box, window.background.csd > hdyleaflet > box.vertical > searchbar > revealer > box, window.background.csd > leaflet > box.vertical > searchbar > revealer > box, window.background.csd > box.horizontal > box.vertical > searchbar > revealer > box {
   border-color: #d6d6d6;
 }
 
@@ -5961,60 +6005,60 @@ window.background.csd > overlay > leaflet > separator.sidebar, box.horizontal >
 hdyleaflet > separator.sidebar,
 leaflet > separator.sidebar, window.background.csd > box.horizontal:not(.titlebar) > separator.vertical, window.background.csd > headerbar.titlebar > box.horizontal > separator.sidebar,
 window.background.csd > headerbar.titlebar > hdyleaflet > separator.sidebar,
-window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
+window.background.csd > headerbar.titlebar > leaflet > separator.sidebar, window.background.csd > hdyleaflet > separator.vertical, window.background.csd > leaflet > separator.vertical, window.background.csd > box.horizontal > separator.vertical, .titlebar:not(headerbar) > separator, window.org-gnome-gedit > paned.titlebar > separator, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator, window.org-gnome-gedit > paned.titlebar > separator:backdrop, window.org-gnome-gedit > overlay > box.vertical > paned.gedit-side-panel-paned > separator:backdrop {
   background-image: image(#d6d6d6);
   background-color: transparent;
   border-right: none;
 }
 
-.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, hdyleaflet frame.view, leaflet frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list) {
+.tweak-group-startup, list.tweak-group list, hdyleaflet list.view, hdyleaflet list.frame, leaflet list.view, leaflet list.frame, box.horizontal > stack.background list.view, box.horizontal > stack.background list.frame, hdyleaflet frame.view, leaflet frame.view, box.horizontal > stack.background frame.view, hdyleaflet frame:not(.view) list:not(.contacts-contact-list), leaflet frame:not(.view) list:not(.contacts-contact-list), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) {
   border-radius: 12px;
   box-shadow: inset 0 0 8px rgba(0, 0, 0, 0.02), inset 0 0 3px rgba(0, 0, 0, 0.01), inset 0 0 0 1px rgba(0, 0, 0, 0.04), inset 0 1px rgba(0, 0, 0, 0.05);
   background-color: rgba(0, 0, 0, 0.03);
   border: none;
 }
 
-.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator {
+.tweak-group-startup > separator, list.tweak-group list > separator, hdyleaflet list.view > separator, hdyleaflet list.frame > separator, leaflet list.view > separator, leaflet list.frame > separator, box.horizontal > stack.background list.view > separator, box.horizontal > stack.background list.frame > separator, hdyleaflet frame.view > separator, leaflet frame.view > separator, box.horizontal > stack.background frame.view > separator, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) > separator, leaflet frame:not(.view) list:not(.contacts-contact-list) > separator, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) > separator {
   background: none;
   min-height: 0;
 }
 
-list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
+list.tweak-group list row.activatable:first-child, hdyleaflet list.view row.activatable:first-child, hdyleaflet list.frame row.activatable:first-child, leaflet list.view row.activatable:first-child, leaflet list.frame row.activatable:first-child, box.horizontal > stack.background list.view row.activatable:first-child, box.horizontal > stack.background list.frame row.activatable:first-child, hdyleaflet frame.view list row.activatable:first-child, leaflet frame.view list row.activatable:first-child, box.horizontal > stack.background frame.view list row.activatable:first-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:first-child {
   border-top-left-radius: 12px;
   border-top-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
+list.tweak-group list row.activatable:last-child, hdyleaflet list.view row.activatable:last-child, hdyleaflet list.frame row.activatable:last-child, leaflet list.view row.activatable:last-child, leaflet list.frame row.activatable:last-child, box.horizontal > stack.background list.view row.activatable:last-child, box.horizontal > stack.background list.frame row.activatable:last-child, hdyleaflet frame.view list row.activatable:last-child, leaflet frame.view list row.activatable:last-child, box.horizontal > stack.background frame.view list row.activatable:last-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:last-child {
   border-bottom-left-radius: 12px;
   border-bottom-right-radius: 12px;
 }
 
-list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
+list.tweak-group list row.activatable:only-child, hdyleaflet list.view row.activatable:only-child, hdyleaflet list.frame row.activatable:only-child, leaflet list.view row.activatable:only-child, leaflet list.frame row.activatable:only-child, box.horizontal > stack.background list.view row.activatable:only-child, box.horizontal > stack.background list.frame row.activatable:only-child, hdyleaflet frame.view list row.activatable:only-child, leaflet frame.view list row.activatable:only-child, box.horizontal > stack.background frame.view list row.activatable:only-child, hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child, box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable:only-child {
   border-radius: 12px;
 }
 
-hdyleaflet list > row.activatable, leaflet list > row.activatable {
+hdyleaflet list > row.activatable, leaflet list > row.activatable, box.horizontal > stack.background list > row.activatable {
   margin: 2px 4px;
   border-radius: 8px;
   -gtk-outline-radius: 6px;
 }
 
-hdyleaflet frame > border, leaflet frame > border {
+hdyleaflet frame > border, leaflet frame > border, box.horizontal > stack.background frame > border {
   border: none;
 }
 
-hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
+hdyleaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), leaflet frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button), box.horizontal > stack.background frame:not(.view) list:not(.contacts-contact-list) row.activatable .row-header > button:not(.text-button) {
   min-height: 28px;
   min-width: 28px;
   padding: 0;
   margin: 4px 0;
 }
 
-hdyleaflet frame.view list, leaflet frame.view list {
+hdyleaflet frame.view list, leaflet frame.view list, box.horizontal > stack.background frame.view list {
   background: none;
 }
 
-hdyleaflet frame.view list > separator, leaflet frame.view list > separator {
+hdyleaflet frame.view list > separator, leaflet frame.view list > separator, box.horizontal > stack.background frame.view list > separator {
   background: none;
   min-height: 0;
 }
diff --git a/src/other/dash-to-dock/README.md b/src/other/dash-to-dock/README.md
index bd97e41..97858f0 100644
--- a/src/other/dash-to-dock/README.md
+++ b/src/other/dash-to-dock/README.md
@@ -4,7 +4,7 @@
 
 ### Install tips
 
-Usage:  `./Install`  **[OPTIONS...]**
+Usage:  `./install.sh`  **[OPTIONS...]**
 
 |  OPTIONS:           | |
 |:--------------------|:-------------|
diff --git a/src/sass/_variables.scss b/src/sass/_variables.scss
index a08468a..f76315e 100644
--- a/src/sass/_variables.scss
+++ b/src/sass/_variables.scss
@@ -42,6 +42,7 @@ $bt_radius: 6px;
 $bd_radius: 8px;
 $wm_radius: 12px;
 $mn_radius: 10px;
+$maximized_radius: 0;
 
 // durations
 $shorter_duration: 100ms;
diff --git a/src/sass/gnome-shell/widgets/_calendar.scss b/src/sass/gnome-shell/widgets/_calendar.scss
index 1948b6a..b349760 100644
--- a/src/sass/gnome-shell/widgets/_calendar.scss
+++ b/src/sass/gnome-shell/widgets/_calendar.scss
@@ -355,7 +355,7 @@
 }
 
 .message {
-  margin: 2px 4px 6px;
+  margin: 0 4px;
   @extend %popover_bubble;
 
   &:first-child { margin-top: 8px; }
diff --git a/src/sass/gnome-shell/widgets/_popovers.scss b/src/sass/gnome-shell/widgets/_popovers.scss
index c865667..d25f244 100644
--- a/src/sass/gnome-shell/widgets/_popovers.scss
+++ b/src/sass/gnome-shell/widgets/_popovers.scss
@@ -128,17 +128,6 @@ $popop_menuitem_radius: $wm_radius - 4px;
   }
 }
 
-.candidate-popup-boxpointer {
-  -arrow-border-radius: 2px;
-  -arrow-background-color: $dialog_bg_color;
-  -arrow-border-width: 0;
-  -arrow-border-color: transparent;
-  -arrow-base: 5px;
-  -arrow-rise: 5px;
-  background-color: transparent;
-  @extend %theme_dialogs;
-}
-
 .popup-separator-menu-item {
   margin: 0 0;
   padding: 0 0;
@@ -243,7 +232,20 @@ $popop_menuitem_radius: $wm_radius - 4px;
 }
 
 // IBus Candidate Popup
+.candidate-popup-boxpointer {
+  -arrow-border-radius: 2px;
+  -arrow-background-color: transparent;
+  -arrow-border-width: 0;
+  -arrow-border-color: transparent;
+  -arrow-base: 64px;
+  -arrow-rise: 12px;
+  background-color: transparent;
+}
+
 .candidate-popup-content {
+  @extend %theme_dialogs;
+  box-shadow: 0 8px 16px 0 rgba(black, 0.25);
+  border: 1px solid if($variant=='light', rgba(black, 0), rgba(black, 0.75));
   padding: 8px;
   spacing: 0;
 }
@@ -258,6 +260,7 @@ $popop_menuitem_radius: $wm_radius - 4px;
   transition-duration: 0ms; // FIXME: needs more natural transitions
   min-height: $menuitem_size;
   padding: 0 8px;
+  margin-right: 2px;
   border-radius: $bt_radius;
   &:hover { background-color: $divider_color; color: $fg_color; }
   &:active { background-color: $track_color; color: $fg_color; }
diff --git a/src/sass/gtk/_applications.scss b/src/sass/gtk/_applications.scss
index b61395e..368ec76 100644
--- a/src/sass/gtk/_applications.scss
+++ b/src/sass/gtk/_applications.scss
@@ -31,7 +31,7 @@ terminal-window {
     }
   }
 
-  // &.background.csd.maximized { border-radius: 0 0 0 0; } // Fixed gnome 3.32 issue: Unable to restore window size after maximization
+  &.background.csd.maximized { border-radius: 0 0 0 0; } // Fixed gnome 3.32 issue: Unable to restore window size after maximization
 }
 
 window.background.csd { // gnome-terminal 3.32 setting
@@ -351,10 +351,11 @@ $nautilus_background_image: linear-gradient(90deg, $dark_sidebar_bg 0%,
   }
 
   // Reset maximized nautilus-window border-radius
-  // &.maximized {
-  //   notebook { &, > stack { border-radius: 0; } }
-  //   headerbar, placessidebar { border-radius: 0; }
-  // }
+  &.maximized {
+    notebook { &, > stack { border-radius: 0 0 $maximized_radius $maximized_radius; } }
+    headerbar { border-radius: $maximized_radius $maximized_radius 0 0; }
+    placessidebar { border-bottom-left-radius: $maximized_radius; }
+  }
 
   placesview {
     row.activatable {
@@ -634,9 +635,6 @@ $disk_space_free: darken($bg_color, 3%);
 window.org-gnome-gedit {
   > paned.titlebar {
     > headerbar {
-      // &:first-child { @extend %side_headerbar_left; }
-      // &:last-child { @extend %side_headerbar_right; }
-
       button.flat.toggle.popup:not(.image-button) { // left-pane header button
         @extend %headerbar_buttons;
 
@@ -681,6 +679,20 @@ window.org-gnome-gedit {
       }
     }
   }
+
+  .tiled &,
+  .maximized &,
+  .fullscreen & {
+    > overlay > box.vertical {
+      > paned.gedit-side-panel-paned {
+        > box.vertical > stack > grid.horizontal {
+          > scrolledwindow { // raised widget
+            border-bottom-left-radius: $maximized_radius;
+          }
+        }
+      }
+    }
+  }
 }
 
 .open-document-selector-treeview.view {
@@ -1402,7 +1414,7 @@ $list_shadow: if($variant == 'light',
   -gtk-outline-radius : $wm_radius - 6px;
 }
 
-hdyleaflet, leaflet {
+hdyleaflet, leaflet, box.horizontal > stack.background {
   frame > border { border: none; }
 
   frame:not(.view) list:not(.contacts-contact-list) { // Don't set this to Gnome-Contacts
@@ -1470,7 +1482,7 @@ list {
 
 // separator of sidebar on Gnome contol center and Gnome tweaks
 window.background.csd {
-  > hdyleaflet, > leaflet {
+  > hdyleaflet, > leaflet, > box.horizontal {
     > separator.vertical {
       @extend %side_separator;
     }
diff --git a/src/sass/gtk/_common.scss b/src/sass/gtk/_common.scss
index 46f70a8..40afcdc 100644
--- a/src/sass/gtk/_common.scss
+++ b/src/sass/gtk/_common.scss
@@ -1473,7 +1473,7 @@ headerbar {
 
   .tiled &, .tiled &:backdrop,
   .maximized &, .maximized &:backdrop {
-    // border-radius: 0; // squared corners when the window is max'd or tiled
+    border-radius: $maximized_radius $maximized_radius 0 0; // squared corners when the window is max'd or tiled
     box-shadow: none;
   }
 
@@ -1522,8 +1522,8 @@ headerbar {
     &, &:backdrop {
       border-top-left-radius: $wm_radius;
 
-      // .maximized &,
-      // .tiled & { border-radius: 0; }
+      .maximized &,
+      .tiled & { border-top-left-radius: $maximized_radius; }
     }
   }
 
@@ -1531,8 +1531,8 @@ headerbar {
     &, &:backdrop {
       border-top-right-radius: $wm_radius;
 
-      // .maximized &,
-      // .tiled & { border-radius: 0; }
+      .maximized &,
+      .tiled & { border-top-right-radius: $maximized_radius; }
     }
   }
 
@@ -1556,12 +1556,21 @@ headerbar {
     }
   }
 
-  // window.tiled &,
-  // window.tiled-top &,
-  // window.tiled-right &,
-  // window.tiled-bottom &,
-  // window.tiled-left &,
-  // window.maximized &,
+  window.tiled &,
+  window.tiled-top &,
+  window.tiled-right &,
+  window.tiled-bottom &,
+  window.tiled-left &,
+  window.maximized & {
+    &,
+    &:first-child,
+    &:last-child,
+    &:only-child {
+      border-top-left-radius: $maximized_radius;
+      border-top-right-radius: $maximized_radius;
+    }
+  }
+
   window.fullscreen &,
   .solid-csd & {
     &,
@@ -1583,9 +1592,16 @@ headerbar {
   &, & headerbar {
     box-shadow: inset 0 1px $highlight_color;
 
-    // .tiled &,
-    // .maximized &,
-    .fullscreen & { box-shadow: none; }
+    .tiled &,
+    .maximized &,
+    .fullscreen & {
+      box-shadow: none;
+
+      &, &.background {
+        border-top-left-radius: $maximized_radius;
+        border-top-right-radius: $maximized_radius;
+      }
+    }
   }
 
   > box.left.horizontal,
@@ -3231,10 +3247,7 @@ calendar {
 //
 
 messagedialog { // Message Dialog styling
-
-  &.background {
-    background-color: rgba($bg_color, 0.95);
-  }
+  &.background { background-color: rgba($bg_color, 0.95); }
 
   .titlebar {
     min-height: 28px;
@@ -3889,7 +3902,7 @@ stackswitcher {
 
 decoration {
   transition: $shadow_transition;
-  border-radius: if($variant=='light', $wm_radius, $wm_radius);
+  border-radius: $wm_radius;
   box-shadow: 0 3px 3px 0 $wm_shadow,
               0 8px 8px 0 $wm_shadow,
               0 16px 16px 0 $wm_shadow,
@@ -3914,6 +3927,7 @@ decoration {
   .tiled-right &,
   .tiled-bottom &,
   .tiled-left & {
+    border-radius: $maximized_radius;
     box-shadow: 0 3px 3px 0 $wm_shadow, $wm_outline;
   }
 
@@ -3929,7 +3943,8 @@ decoration {
     margin: -5px;
     border-radius: $wm_radius $wm_radius 0 0;
     box-shadow: 0 0 5px 0 $wm_shadow, $wm_outline;
-    // &.maximized { border-radius: 0; }
+
+    &.maximized { border-radius: $maximized_radius $maximized_radius 0 0; }
   }
 
   .csd.popup & {