diff --git a/index.html b/index.html
index 801016ad..685746d9 100644
--- a/index.html
+++ b/index.html
@@ -4,6 +4,25 @@
   <meta charset="UTF-8">
   <meta name="viewport" content="width=device-width, initial-scale=1.0">
   <title>Firebase + Three.js</title>
+   <style>
+    body {
+      margin: 0;
+      font-family: Arial, sans-serif;
+    }
+    .screen {
+      display: none;
+      position: absolute;
+      top: 0;
+      left: 0;
+      width: 100%;
+      height: 100%;
+      background: #000;
+      color: #fff;
+    }
+    .active {
+      display: block;
+    }
+   </style>
 </head>
 <body>
   <script type="module" src="js/app.js"></script>
