diff --git a/src/components/left/main/LeftMain.scss b/src/components/left/main/LeftMain.scss
index ef9477894..5962992e0 100644
--- a/src/components/left/main/LeftMain.scss
+++ b/src/components/left/main/LeftMain.scss
@@ -78,5 +78,9 @@
     margin: 0 auto;
 
     white-space: nowrap;
+
+    &.opacity-transition {
+      transition: background-color 0.2s, color 0.2s, opacity 0.15s ease;
+    }
   }
 }