<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>Pseudo Classes</title>
  <link rel="stylesheet" href="style.css" />
</head>
<body>
  <header class="page-header">
    <h1>Pseudo Classes</h1>
    <p class="lead">:hover, :focus, :active, :first-child, :nth-child(), :not().</p>
  </header>
  <main class="demo">
    <button class="pc">Hover / Focus me</button>
    <ul class="list">
      <li>First</li><li>Second</li><li>Third</li><li>Fourth</li>
    </ul>
  </main>
</body>
</html>