HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS How-To Complete Example</title>
  <style>
    body {
      margin: 0;
      padding: 2rem;
      font-family: system-ui, sans-serif;
      background-color: #f4f4f4;
    }

    h1 {
      color: #333;
      text-align: center;
      font-size: 1.25rem;
    }

    .box {
      width: 100px;
      height: 100px;
      background-color: #ef4444;
      margin: 1.5rem auto;
      border: 2px solid #991b1b;
      border-radius: 10px;
      transition: background-color 0.5s;
    }

    .box:hover {
      background-color: #2563eb;
    }

    p {
      text-align: center;
      color: #64748b;
      font-size: 0.875rem;
    }
  </style>
</head>
<body>
  <h1>CSS How-To Example</h1>
  <div class="box" title="Hover me"></div>
  <p>Hover the box to see a color transition.</p>
</body>
</html>

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Complete Page — Borders, Layout &amp; Hover

Complete Page — Borders, Layout & Hover