diff --git a/static/index.html b/static/index.html
index fa96e71d0..7127011d5 100644
--- a/static/index.html
+++ b/static/index.html
@@ -84,12 +84,12 @@
             input[type="submit"] {
                 width: 45px;
                 margin-left: -50px;
-                padding: 7px
+                padding: 8px
             }
             input[type="submit"]::-moz-focus-inner {
                 border: 0
             }
-            @media screen and (-webkit-min-device-pixel-ratio:0){ input[type="submit"] {padding: 8px} }
+            @-moz-document url-prefix() { input[type="submit"] {padding: 7px} }
         </style> 
         <link href="static/custom/index.css" rel="stylesheet"> 
         <script src="static/custom/index.js"></script>