diff --git a/gtk/resources/theme/Adwaita/_common.scss b/gtk/resources/theme/Adwaita/_common.scss
index 1f6e65b78e..4f3f46690c 100644
--- a/gtk/resources/theme/Adwaita/_common.scss
+++ b/gtk/resources/theme/Adwaita/_common.scss
@@ -59,7 +59,7 @@ $ease-out-quad: cubic-bezier(0.25, 0.46, 0.45, 0.94);
 
 .background {
   color: $fg_color;
-  background-color: if($variant == 'light', mix($fg_color, $bg_color, 0.015), $bg_color);
+  background-color: if($variant == 'light', darken($bg_color, 1.5%), $bg_color);
 
   &:backdrop {
     text-shadow: none;
diff --git a/gtk/resources/theme/Adwaita/gtk-contained.css b/gtk/resources/theme/Adwaita/gtk-contained.css
index 343846bd29..bae135dfca 100644
--- a/gtk/resources/theme/Adwaita/gtk-contained.css
+++ b/gtk/resources/theme/Adwaita/gtk-contained.css
@@ -31,7 +31,7 @@
  ***************/
 .background {
   color: #2e3436;
-  background-color: #ececec; }
+  background-color: #e9e9e9; }
   .background:backdrop {
     text-shadow: none;
     icon-shadow: none;