diff --git a/app/assets/stylesheets/zammad.css.scss.erb b/app/assets/stylesheets/zammad.css.scss.erb
index eaea3d787..5267e7c61 100644
--- a/app/assets/stylesheets/zammad.css.scss.erb
+++ b/app/assets/stylesheets/zammad.css.scss.erb
@@ -2459,6 +2459,9 @@ footer {
     display: block;
     border-radius: 0;
     background: none;
+    -webkit-appearance: none;
+       -moz-appearance: none;
+            appearance: none;
   }
 
   .bulkAction-secondStep .form-group {