demo.html

<!DOCTYPE html>
<html>

<head>
  <title>Cat Vote Example</title>
  <link href="cat_vote.css" media="all" rel="stylesheet" />
  <link href="https://fonts.googleapis.com/css?family=Concert+One" rel="stylesheet">
</head>

<body>
  <div class="vote_cat">
    <a href="javascript://">
      <div class="bg layer1" style="display: block;"></div>
      <div class="bg layer2" style="display: none;"></div>
      <span class="message" style="display: none;">MEOW :)</span>
    </a>
    <audio id="vote_cat_sound" controls="controls" preload="auto">
      <source src="cat_sound.mp3" type="audio/mpeg">
      <source src="cat_sound.ogg" type="audio/ogg">
    </audio>
  </div>
  <script crossorigin="anonymous" src="bower_components/jquery/dist/jquery.min.js"></script>
  <script crossorigin="anonymous" src="cat_vote.js"></script>
</body>

</html>