improve background

index.html

@@ -100,7 +100,7 @@
             var isMobile = /Android|webOS|iPhone|iPad|iPod|BlackBerry|IEMobile|Opera Mini/i.test(navigator.userAgent);
             if (isMobile) {
                 wwads += '\n\n----\n\n';
-                wwads += '<div class="wwads-cn wwads-horizontal" data-id="239" style="max-width:100%"></div>';
+                wwads += '<div class="wwads-cn wwads-horizontal" data-id="239" style="max-width:100%;background:#fff"></div>';
             }
             return editHtml
               + html