don't let the textarea overflow the body

www/text/index.html

@@ -4,9 +4,10 @@
     <meta content="text/html; charset=utf-8" http-equiv="content-type"/>
     <script data-main="main" src="/bower_components/requirejs/require.js"></script>
     <style>
-        *{
+        html, body{
             padding: 0px;
             margin: 0px;
+            overflow: hidden;
         }
         textarea{
             box-sizing: border-box;
@@ -20,6 +21,8 @@
             color: #839496;
 
             overflow-x: hidden;
+            max-width: 100%;
+            max-height: 100vh;
         }
     </style>
 </head>