diff --git a/server/camlistored/ui/spinner.css b/server/camlistored/ui/spinner.css
index 93ab0d5a4..fb886e5c8 100644
--- a/server/camlistored/ui/spinner.css
+++ b/server/camlistored/ui/spinner.css
@@ -17,6 +17,7 @@ limitations under the License.
 .cam-spinner {
   position: relative;
   background-size: 100%;
+  overflow: hidden;
 }
 
 .cam-spinner>div {