index.html


<!DOCTYPE html>
<html>
  <head>
    <meta charset="utf-8">
    <title>void</title>
    <meta name="viewport" content="width=device-width,initial-scale=1">
    <style type="text/css">
      html, body {
        font-family: -apple-system, BlinkMacSystemFont, "Segoe UI Emoji", "Segoe UI", "Roboto", "Oxygen", "Ubuntu", "Cantarell", "Fira Sans", "Droid Sans", "Helvetica Neue", sans-serif;
        background-color: white;
        box-sizing: border-box;
        width: 100%;
        height: 100%;
        margin: 0;
        text-align: center;
      }

      h1 {
        background-color: black;
        color: white;
        margin: 0;
        padding: .7em;
      }

      body:fullscreen * {
        display: none;
      }
      body:-moz-full-screen * {
        display: none;
      }
      body:-ms-fullscreen * {
        display: none;
      }
      body:-webkit-full-screen * {
        display: none;
      }
    </style>
  </head>
  <body>
    <h1>void</h1>
    <p>Just a white void for your device 🏳</p>
    <button>Show void</button>

    <script type="text/javascript">
      var body = document.body;
      var requestFullscreen = body.requestFullscreen || body.mozRequestFullScreen || body.msRequestFullscreen || body.webkitRequestFullScreen || function() {
        this.innerHTML = "";
      };
      document.getElementsByTagName("button")[0].addEventListener("click", requestFullscreen.bind(body));
    </script>
  </body>
</html>