Fixed #1006

src/sass/_colors.scss

@@ -2,6 +2,19 @@
   @return unquote("alpha(#{$c},#{$a})");
 }
 
+@function gtkmix($c1,$c2,$r) {
+  $ratio: 1 -  $r / 100%; // match SCSS mix()
+  @return unquote("mix(#{$c1},#{$c2},#{$ratio})");
+}
+
+@function gtkshade($c,$s) {
+  @return unquote("shade(#{$c},#{$s})");
+}
+
+@function gtkcolor($c) {
+  @return unquote("@#{$c}");
+}
+
 // base options
 @import 'theme-options-temp';
 @import 'gtk-base-temp';

src/sass/gtk/apps/_gnome-40.0.scss

@@ -154,7 +154,6 @@ $flap_sidebar_size: 240px;
       min-height: 24px;
       min-width: 24px;
       padding: 0;
-      -gtk-icon-shadow: none;
       @extend %selected-button;
     }
   }
@@ -1109,14 +1108,6 @@ scrolledwindow.fake-adw-status-page > viewport > box > clamp:not(:last-child) >
 scrolledwindow.fake-adw-status-page > viewport > box > clamp > box > .icon:not(:last-child) { margin-bottom: $container_padding * 6; }
 scrolledwindow.fake-adw-status-page > viewport > box > clamp > box > .title:not(:last-child) { margin-bottom: $container_padding * 2; }
 
-statuspage.icon-dropshadow image.icon {
-	-gtk-icon-shadow: 0 1px 12px rgba(0,0,0,0.05),
-	                  0 -1px rgba(0,0,0,0.05),
-	                  1px 0 rgba(0,0,0,0.1),
-	                  0 1px rgba(0,0,0,0.3),
-	                  -1px 0 rgba(0,0,0,0.1);
-}
-
 window.info scrollbar.vertical {
   margin-top: 48px;
   background: none;