fiddle background color of site display for mobile

browserid/static/dialog/css/m.css

@@ -55,7 +55,7 @@ body #signIn form {
 
 body #favicon {
     border-bottom: 1px solid rgba(0,0,0,0.05);
-    background-color: rgba(255,255,255,0.25);
+    background-image: url('/i/bg.png');
     text-align: center;
     left: 0;
 }