<!doctype html>
<html lang="en-US">
  <head>
    <title></title>
    <meta charset="UTF-8" />
    <style type="text/css">
        
    body {
      font: 18px;
    }

    mark {
      font-family: courier, monospace;
      font-size: 12px;
    }

    strong {
      font-size: 15px;
    }

    em {
      font-size: 20px;
      text-transform: uppercase;
    }
    
    code {
      font-style: italic;
      text-decoration: underline;
    }

    </style>
  </head>
  <body>
    <p>That episode was <mark>un<strong>be<em>lieve</em></strong>able</mark>!</p>
  </body>
</html> 