diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 08be69444b..551e6f2b56 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -2039,7 +2039,7 @@ scrollbar {
 
   &:backdrop {
     background-color: $backdrop_scrollbar_bg_color;
-    border-color: backdrop_borders_color;
+    border-color: $backdrop_borders_color;
   }
 
   // slider
diff --git a/gtk/theme/Adwaita/gtk-contained-dark.css b/gtk/theme/Adwaita/gtk-contained-dark.css
index b5dbb17653..ab033bdd42 100644
--- a/gtk/theme/Adwaita/gtk-contained-dark.css
+++ b/gtk/theme/Adwaita/gtk-contained-dark.css
@@ -2193,7 +2193,7 @@ scrollbar {
     border-left: 1px solid #1c1f1f; }
   scrollbar:backdrop {
     background-color: #323737;
-    border-color: backdrop_borders_color; }
+    border-color: #1f2222; }
   scrollbar slider {
     min-width: 8px;
     min-height: 8px;
diff --git a/gtk/theme/Adwaita/gtk-contained.css b/gtk/theme/Adwaita/gtk-contained.css
index d34513bf14..aa42248dcf 100644
--- a/gtk/theme/Adwaita/gtk-contained.css
+++ b/gtk/theme/Adwaita/gtk-contained.css
@@ -2203,7 +2203,7 @@ scrollbar {
     border-left: 1px solid #9d9d99; }
   scrollbar:backdrop {
     background-color: #e1e1df;
-    border-color: backdrop_borders_color; }
+    border-color: #a5a5a1; }
   scrollbar slider {
     min-width: 8px;
     min-height: 8px;