404.html

<!doctype html>
<html>
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <meta name="robots" content="none">
    <title>404 Not Found – A-Frame Link Demo</title>
    <style>
      html {
        background: rgb(239,94,45);
        font-size: 16px;
      }

      body {
        color: rgba(255,255,255,.75);
        font: 1.25rem/1.5 Consolas, Andale Mono, Monaco, Courier New, monospace;
        font-size: calc(1rem + .5vw);
        max-width: 760px;
        padding: 3%;
      }

      a {
        border-bottom: 1px solid rgba(255,255,255,.5);
        color: #fff;
        font-weight: 600;
        padding-bottom: 2px;
        text-decoration: none;
      }

      a:hover {
        border-bottom-color: #fff;
      }

      h1, p {
        margin: 1rem 0;
      }

      h1 {
        color: #fff;
        margin-top: 0;
      }
    </style>
  </head>
  <body>
    <h1>404 Not Found</h1>
    <p>Sorry, we could not find the page or file you requested.</p>
    <p>It's possible that the link you clicked is out of date or the address was typed incorrectly.</p>
    <p>Visit <a href="./" id="home-link">home</a>.</p>
    <script>
      (function () {
        // Check if we are being served from GitHub Pages.
        if (window.location.pathname.indexOf('/aframe-link-demo/') === 0) {
          var homeLink = document.querySelector('#home-link');
          if (homeLink) {
            // Change URL for the "home" page.
            homeLink.setAttribute('href', '/aframe-link-demo/');
          }
        }
      })();
    </script>
  </body>
</html>