diff --git a/src/sass/gtk/_common-3.0.scss b/src/sass/gtk/_common-3.0.scss
index 3c3601a..455ae40 100644
--- a/src/sass/gtk/_common-3.0.scss
+++ b/src/sass/gtk/_common-3.0.scss
@@ -4250,9 +4250,10 @@ decoration {
 
   // server-side decorations as used by mutter
   .ssd & {
-    @extend .csd;
-    border-bottom-left-radius: 0;
-    border-bottom-right-radius: 0;
+    border-radius: $wm_radius $wm_radius 0 0;
+    box-shadow: $wm_outline;
+    &.backdrop { box-shadow: $wm_outline; }
+    &.maximized { border-radius: 0; }
   }
 
   .csd.popup & {