diff --git a/src/Whoops/Resources/css/whoops.base.css b/src/Whoops/Resources/css/whoops.base.css
index c70e9a3..1b1053c 100644
--- a/src/Whoops/Resources/css/whoops.base.css
+++ b/src/Whoops/Resources/css/whoops.base.css
@@ -41,6 +41,7 @@ header {
   padding: 35px 40px;
   max-height: 180px;
   overflow: hidden;
+  transition: 0.5s;
 }
 
   header:hover {