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<html>

<head>
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  <title>Jenkins Status</title>

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<body>
  <header>
    <h1>Jenkins Status</h1>
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</html>

<!DOCTYPE html>
<html>

<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">
  <title>Jenkins Status</title>

  <link rel="stylesheet" href="css/lib/normalize.css">
  <link rel="stylesheet/less" type="text/css" href="css/style.less">

  <script src="js/lib/less-1.3.1.min.js"></script>
</head>

<body>
  <header>
    <h1>Jenkins Status</h1>
  </header>
  <img class="loading" src="imgs/loading.gif" />
  <script src="js/lib/jquery-1.8.2.min.js"></script>
  <script src="js/lib/underscore-1.4.2.min.js"></script>
  <script src="js/utils.js"></script>
  <script src="js/status.js"></script>
</body>

</html>

Add a <meta> viewport tag
Add a <meta> viewport tag