HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS #id Header Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      margin: 0;
    }

    #site-header {
      background: #1e3a8a;
      color: #fff;
      padding: 1rem 1.5rem;
      display: flex;
      justify-content: space-between;
      align-items: center;
    }

    #site-header h1 {
      margin: 0;
      font-size: 1.25rem;
    }

    #site-header nav a {
      color: #bfdbfe;
      text-decoration: none;
      margin-left: 1rem;
      font-size: 0.9375rem;
    }
  </style>
</head>
<body>
  <header id="site-header">
    <h1>My Website</h1>
    <nav>
      <a href="#">Home</a>
      <a href="#">About</a>
      <a href="#">Contact</a>
    </nav>
  </header>
  <main style="padding:1.5rem;">
    <p>Page content goes here.</p>
  </main>
</body>
</html>

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CSS #id Selector - Site Header