<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8" />
  <meta name="viewport" content="width=device-width, initial-scale=1.0" />
  <title>CSS Selectors</title>
  <link rel="stylesheet" href="style.css" />
</head>
<body>
  <header class="page-header">
    <h1>CSS Selectors</h1>
    <p class="lead">Element, class, id, universal, and grouped selectors.</p>
  </header>
  <main class="demo">
    <h2 id="main-title">Element + ID + Class</h2>
    <p class="intro">Paragraph with class .intro</p>
    <p>Plain paragraph.</p>
    <a href="#">A link</a>
  </main>
</body>
</html>