<body>
  <div class="container">
    <h1>Hello World</h1>
    <ul>
      <li>List 1</li>
      <li>List 2</li>
      <li>List 3</li>
    </ul>
  </div>
</body>
body {
  font-size: 18px;
}

h1 {
  font-size: 2em;
}

ul {
  font-size: 1.5em;
}

li {
  font-size: 1.5em;  
}

External CSS

This Pen doesn't use any external CSS resources.

External JavaScript

This Pen doesn't use any external JavaScript resources.