Fix Popup Implementation

src/app/components/popup/popup.scss

@@ -67,7 +67,7 @@ $default_animation_duration: 0.2s;
   align-items: center;
   padding: 0 12px;
   height: 40px;
-  box-shadow: 0 1px 0 oklch(0 0 0 / 20%);
+  box-shadow: 0 1px 0 light-dark(oklch(0 0 0 / 20%), oklch(1 0 0 / 20%));
 
   .header-left {
     display: flex;