diff --git a/gtk/theme/Adwaita/_common.scss b/gtk/theme/Adwaita/_common.scss
index e01d2bfb71..9ac6b1beba 100644
--- a/gtk/theme/Adwaita/_common.scss
+++ b/gtk/theme/Adwaita/_common.scss
@@ -3901,6 +3901,13 @@ expander-widget title:hover > expander {
   color: lighten($fg_color,30%); //only lightens the icon 
 }
 
+expander-widget {
+  &:not(decoration):not(window):drop(active):focus,
+  &:not(decoration):not(window):drop(active) {
+    box-shadow: none;
+  }
+}
+
 
 /************
  * Calendar *