index.html

<!DOCTYPE html>
<html>
<head>
  <title>Share Button Test</title>
  <style>
    html { width: 100%; height: 100%; overflow: hidden; }
    body { -webkit-font-smoothing: antialiased;width: 100%; height: 100%;overflow: hidden;margin: 0; padding: 0;background: #4f3b5b;background: -moz-radial-gradient(center, ellipse cover,  #4f3b5b 0%, #231733 100%);background: -webkit-gradient(radial, center center, 0px, center center, 100%, color-stop(0%,#4f3b5b), color-stop(100%,#231733));background: -webkit-radial-gradient(center, ellipse cover,  #4f3b5b 0%,#231733 100%);background: -o-radial-gradient(center, ellipse cover,  #4f3b5b 0%,#231733 100%);background: -ms-radial-gradient(center, ellipse cover,  #4f3b5b 0%,#231733 100%);background: radial-gradient(ellipse at center,  #4f3b5b 0%,#231733 100%);}
    .share-button { margin: auto; position: absolute; top: 0; left: 0; bottom: 0; right: 0; }
    .fork img { opacity: .6; -webkit-transition: all .5s ease; transition: all .5s ease; }
    .fork img:hover { opacity: 1; }
  </style>
  <meta name='description' content='A simple, light, flexible, and good-looking share button'>
  <meta name='og:image' content='http://carrot.is/img/fb-share.jpg'>
</head>
<body>
  <a class='fork' href="https://github.com/carrot/share-button">
    <img style="position: absolute; top: 0; right: 0; border: 0;" src="https://www.sharebutton.co/images/fork-me.png" alt="Fork me on GitHub">
  </a>
  <div id="share-button-top" class='share-button share-button-top'></div>
  <script src='build/share.js'></script>
  <script>
    var share = new Share("#share-button-top", {
      networks: {
        facebook: {
          app_id: "602752456409826",
        }
      }
    });
  </script>
</body>
</html>