diff --git a/css/leptonChrome.css b/css/leptonChrome.css
index 89055bd..3050f29 100644
--- a/css/leptonChrome.css
+++ b/css/leptonChrome.css
@@ -1294,7 +1294,7 @@
       --panel-border-color: var(--menu-border-color) !important;
     }
     html#main-window menupopup:not(.in-menulist) menuseparator {
-      border-top: 1px solid var(--menu-border-color);
+      border-top: 1px solid var(--menu-border-color) !important;
     }
     html#main-window menupopup:not(.in-menulist) menu[disabled="true"],
     html#main-window menupopup:not(.in-menulist) menu[_moz-menuactive="true"][disabled="true"],
diff --git a/src/theme/_fully_color.scss b/src/theme/_fully_color.scss
index 192df25..30af148 100644
--- a/src/theme/_fully_color.scss
+++ b/src/theme/_fully_color.scss
@@ -30,7 +30,7 @@ html#main-window menupopup:not(.in-menulist) {
       --panel-border-color: var(--menu-border-color) !important;
 
       menuseparator {
-        border-top: 1px solid var(--menu-border-color);
+        border-top: 1px solid var(--menu-border-color) !important;
       }
 
       menu,