HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS Grouped Layout Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      margin: 0;
      background: #f8fafc;
    }

    header, footer, main {
      padding: 1rem 1.5rem;
      max-width: 32rem;
      margin: 0 auto;
    }

    header, footer {
      background: #f1f5f9;
      border: 1px solid #e2e8f0;
    }

    header {
      border-radius: 0.5rem 0.5rem 0 0;
    }

    footer {
      border-radius: 0 0 0.5rem 0.5rem;
    }
  </style>
</head>
<body>
  <header>Site Header</header>
  <main>Main content area with shared horizontal padding.</main>
  <footer>Site Footer</footer>
</body>
</html>

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CSS Selector Grouping - Layout Regions