HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>ID selector demo</title>

  <style>

    #header {

      background-color: #fef08a;

      padding: 1rem;

      border-radius: 8px;

      text-align: center;

    }

    #footer {

      margin-top: 2rem;

      font-size: 0.875rem;

      color: #64748b;

    }

  </style>

</head>

<body>

  <header id="header">

    <h1>Site Header</h1>

  </header>

  <p>IDs should be unique on the page—use them for one-off landmarks.</p>

  <footer id="footer">© 2026 My Site</footer>

</body>

</html>

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How to Add CSS to HTML — ID Selector