body *{ display: none !important;}
body:after {
    margin: 0;
    padding: 0;
    content: url(blob:http%3A//localhost/c9ca105c-064a-4d06-9041-a4d4bfa980b8) url(//mcgeneral.blob.core.windows.net/html5reader/v3.0/Content/standard_loading.png);
}

   /*http://www.thecssninja.com/css/even-better-image-preloading-with-css2*/