diff --git a/plugins/kolab_notes/kolab_notes.php b/plugins/kolab_notes/kolab_notes.php
index e715cecb..6b55f642 100644
--- a/plugins/kolab_notes/kolab_notes.php
+++ b/plugins/kolab_notes/kolab_notes.php
@@ -1253,7 +1253,7 @@ class kolab_notes extends rcube_plugin
         // prepend note links to message body
         if ($html) {
             $this->load_ui();
-            $args['content'] = html::div('kolabmessagenotes ui alert', $html) . $args['content'];
+            $args['content'] = html::div('kolabmessagenotes boxinformation noicon', $html) . $args['content'];
         }
 
         return $args;