diff --git a/src/css/injected.scss b/src/css/injected.scss
index f9ec1ed2..7a5f6219 100644
--- a/src/css/injected.scss
+++ b/src/css/injected.scss
@@ -270,6 +270,7 @@ ul.magicDelete > li.deleting {
 #menu {
   width: 270px;
   z-index: 19;
+  transition-duration: 0.4s;
   background: var(--better-main) !important;
   color: var(--text-color);
   border-right: none;