Add new variable

css/_jitsi_popover.scss

     /*-webkit-box-shadow: 0 5px 10px rgba(0, 0, 0, 0.2);*/
     /*box-shadow: 0 5px 10px rgba(0, 0, 0, 0.4);*/
     white-space: normal;
-    margin-top: -13px;
+    margin-top: -$popoverMenuPadding;
 
     &__menu-padding {
-        height: 13px;
+        height: $popoverMenuPadding;
         width: 100px;
         position: absolute;
-        bottom: -13px;
+        bottom: -$popoverMenuPadding;
     }
 
     &__showmore {

css/_variables.scss

 $borderRadius: 3px;
 $defaultWatermarkLink: '../images/watermark.png';
 $sidebarWidth: 220px;
-
+$popoverMenuPadding: 13px;
 $happySoftwareBackground: transparent;
 
 /**