diff --git a/site/theme/static/header.less b/site/theme/static/header.less
index 52e9a7860e..06041b9b44 100644
--- a/site/theme/static/header.less
+++ b/site/theme/static/header.less
@@ -2,7 +2,6 @@
 @menu-item-border: 2px;
 
 #header {
-  transition: all 0.3s;
   background: #fff;
   box-shadow: 0 2px 8px rgba(240, 241, 242, 65);
   position: relative;
@@ -86,6 +85,7 @@
   color: @text-color;
   border-color: @border-color-base;
   margin-right: 40px;
+  transition: none;
 }
 
 #nav {