diff --git a/toolkit/themes/shared/popup.css b/toolkit/themes/shared/popup.css
index 064d39c586c01270545877ee9506ef3befa45a87..9c68eab80f84e5c2e156ded73242a12ca41e767c 100644
--- a/toolkit/themes/shared/popup.css
+++ b/toolkit/themes/shared/popup.css
@@ -23,8 +23,8 @@ panel {
   --panel-border-color: ThreeDShadow;
   --panel-width: initial;
 
-  --panel-shadow-margin: var(--dimension-4);
-  --panel-shadow: 0 0 var(--panel-shadow-margin) hsla(0, 0%, 0%, 0.2);
+  --panel-shadow-margin: 8px;
+  --panel-shadow: var(--zen-big-shadow);
   -moz-window-input-region-margin: var(--panel-shadow-margin);
   margin: calc(-1 * var(--panel-shadow-margin));
 
