diff --git a/examples/overlay.html b/examples/overlay.html
index 6acde92fb1..9cfa3d8075 100644
--- a/examples/overlay.html
+++ b/examples/overlay.html
@@ -24,6 +24,9 @@
         font-weight: bold;
         text-shadow: black 0.1em 0.1em 0.2em;
       }
+      .popover {
+        z-index: auto;
+      }
       .popover-content {
         min-width: 180px;
       }