hide unstyled content until the loading screen is displayed

www/drive/inner.html

@@ -5,7 +5,7 @@
     <script src="/bower_components/jquery/dist/jquery.min.js"></script>
     <script data-bootload="/drive/inner.js" data-main="/common/boot.js" src="/bower_components/requirejs/require.js"></script>
 </head>
-<body>
+<body style="display: none;">
     <div id="toolbar" class="toolbar-container"></div>
     <div class="app-container" tabindex="0">
         <div id="tree">