diff --git a/website/assets/styles/layout.less b/website/assets/styles/layout.less
index 4165034564..0159c49f7b 100644
--- a/website/assets/styles/layout.less
+++ b/website/assets/styles/layout.less
@@ -59,6 +59,7 @@ html, body {
   }
   .collapsing {
     opacity: 0;
+    transition: 0s;
   }
   .collapse.show {
     opacity: 1;