diff --git a/src/sass/gtk/_common-3.0.scss b/src/sass/gtk/_common-3.0.scss
index 1376d49..d93a41d 100644
--- a/src/sass/gtk/_common-3.0.scss
+++ b/src/sass/gtk/_common-3.0.scss
@@ -4250,22 +4250,13 @@ decoration {
 
   // server-side decorations as used by mutter
   .ssd & {
+    margin: -6px;
     border-radius: $wm_radius $wm_radius 0 0;
 
-    &， &.backdrop { box-shadow: $wm_outline; }
+    &, &.backdrop { box-shadow: $wm_outline; }
     &.maximized, &.tiled { border-radius: 0; }
   }
 
-  .ssd.maximized &,
-  .ssd.fullscreen &,
-  .ssd.tiled &,
-  .ssd.tiled-top &,
-  .ssd.tiled-right &,
-  .ssd.tiled-bottom &,
-  .ssd.tiled-left & {
-    border-radius: 0;
-  }
-
   .csd.popup & {
     border-radius: $mn_radius;
     box-shadow: 0 5px 8px rgba(0, 0, 0, 0.15), 0 8px 15px rgba(0, 0, 0, 0.08), $wm_outline;