diff --git a/core/themes/bartik/css/components/tabs.css b/core/themes/bartik/css/components/tabs.css
index d927c69223e78b6e3ac1cee9d9ead896ef3c22f5..4e8051ee61a0ae098294e78a49ef17355b4d1022 100644
--- a/core/themes/bartik/css/components/tabs.css
+++ b/core/themes/bartik/css/components/tabs.css
@@ -75,6 +75,7 @@ div.tabs {
   border-bottom: none;
   margin: 5px;
   padding: 0.5em 0;
+  overflow: hidden;
 }
 .tabs ul.secondary li {
   border-right: 1px solid #ccc; /* LTR */