message: Removed margins so zoom stays in bounds
diff: <head>
  <title>Navigation React Native</title>
  </head>
  -<body>
  - <div id="content" style="width: 300px; margin: 40px auto"></div>
  +<body style="margin: 0">
  + <div id="content" style="width: 300px;"></div>
  <script src="app.js"></script>
  </body>
  