diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index 119694649d..a552965cdd 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -1845,6 +1845,9 @@ popover.background {
   }
 }
 
+magnifier {
+  background-color: $base_color;
+}
 
 /*************
  * Notebooks *