<!DOCTYPE html>
<html>

<head>
  <meta name="viewport" content="minimum-scale = 2.0">
  <style>
    body {
      margin: 0px;
    }
    #content {
      background: silver;
      width: 200px;
      height: 300px;
    }
  </style>
</head>

<body>
  <div id="content">a</div>
</body>

</html>