diff --git a/src/css/mobile.css b/src/css/mobile.css
index 8b0538674..decb87651 100644
--- a/src/css/mobile.css
+++ b/src/css/mobile.css
@@ -573,6 +573,7 @@ to prevent collapsing during animation*/
 body.modal-open {
   position: fixed;
   overflow: hidden;
+  z-index: 1;
 }
 
 .reveal-modal {