diff --git a/panel/river.css b/panel/river.css
index 85baf83b..6c438335 100644
--- a/panel/river.css
+++ b/panel/river.css
@@ -26,3 +26,6 @@ fieldset.River>div.output div.list div.item.select {
 fieldset.River>div.output div.list div.item:hover {
     background-color:#2e515f;
 }
+body.mobile fieldset.River {
+    z-index:10;
+}