diff --git a/assets/index.less b/assets/index.less
index b7c66ce8..b571d3c1 100644
--- a/assets/index.less
+++ b/assets/index.less
@@ -30,7 +30,8 @@
     direction: rtl;
   }
 
-  &-hidden {
+  &-hidden,
+  &-submenu-hidden {
     display: none;
   }