<html>
  <head>
    <style>
      body, html {
        height: 100%;
      }

      img {
        display: block;
        height: 100%;
        width: 100%;
      }
    </style>
  </head>
  <body>
    <img src="notfound.png" alt="alt_text" />
  </body>
</html>