diff --git a/core/themes/bartik/css/classy/components/messages.css b/core/themes/bartik/css/classy/components/messages.css
index 47459468d2..643fe345dc 100644
--- a/core/themes/bartik/css/classy/components/messages.css
+++ b/core/themes/bartik/css/classy/components/messages.css
@@ -26,6 +26,7 @@
   margin: 0;
   padding: 0;
   list-style: none;
+  overflow-x: scroll;
 }
 .messages__item + .messages__item {
   margin-top: 0.769em;