diff --git a/addons/web/static/src/css/base.css b/addons/web/static/src/css/base.css
index ee81492b8ad..6a351fc9971 100644
--- a/addons/web/static/src/css/base.css
+++ b/addons/web/static/src/css/base.css
@@ -2353,6 +2353,7 @@
   display: none;
   text-align: center;
   color: #eeeeee;
+  overflow: hidden;
   background: rgba(37, 37, 37, 0.9);
   -moz-border-radius: 3px 3px 0 0;
   -webkit-border-radius: 3px 3px 0 0;
diff --git a/addons/web/static/src/css/base.sass b/addons/web/static/src/css/base.sass
index 3923fcaf2ff..18d0c52c66b 100644
--- a/addons/web/static/src/css/base.sass
+++ b/addons/web/static/src/css/base.sass
@@ -1885,6 +1885,7 @@ $sheet-padding: 16px
                 display: none
                 text-align: center
                 color: #eee
+                overflow: hidden
                 background: rgba(37,37,37,0.9)
                 @include radius(3px 3px 0 0)
                 @include box-sizing(border)