templates/index.tpl

{% args req, content %}
<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0, user-scalable=no"/>
  <meta name="description" content="WiFi Manager Index page">
  <meta name="author" content="Jonas Scharpf aka brainelectronics">
  <title>Setup</title>
  <link href="bootstrap.min.css" rel="stylesheet">
  <link rel="shortcut icon" type="image/x-icon" href="favicon.ico">
  <style type="text/css">
    .overlay{position:fixed;top:0;left:0;right:0;bottom:0;background-color:gray;color:#fff;opacity:1;transition:.5s;visibility:visible}
    .overlay.hidden{opacity:0;visibility:hidden}
    .loader{position:absolute;left:50%;top:50%;z-index:1;width:120px;height:120px;margin:-76px 0 0 -76px;border:16px solid #f3f3f3;border-radius:50%;border-top:16px solid #3498db;-webkit-animation:spin 2s linear infinite;animation:spin 2s linear infinite}
    @-webkit-keyframes spin{0%{-webkit-transform:rotate(0)}100%{-webkit-transform:rotate(360deg)}
    }@keyframes spin{0%{transform:rotate(0)}100%{transform:rotate(360deg)}}
  </style>
</head>
<body>
  <div id="overlay" class="overlay">
    <div id="loader" class="loader"></div>
  </div>
  <div style="display:none;" id="container" class="container"><div class="row">
    {{content}}
  </div></div>
  <script>
    window.onload = function(e) {
      setTimeout(showPage, 1000);
    };
    function showPage() {
      document.getElementById("loader").style.display = "none";
      document.getElementById("container").style.display = "block";
      document.getElementById("overlay").style.display = "none";
    };
  </script>
</body>
</html>