HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>CSS rem and vh Example</title>
  <style>
    html {
      font-size: 16px;
    }

    body {
      margin: 0;
      padding: 1.5rem;
      font-family: system-ui, sans-serif;
      background: #f8fafc;
    }

    h1 {
      font-size: 1.25rem;
      color: #1e293b;
    }

    .panel {
      height: 30vh;
      min-height: 120px;
      padding: 1.5rem;
      background: linear-gradient(135deg, #dbeafe, #eff6ff);
      border-radius: 0.5rem;
      display: flex;
      align-items: center;
      justify-content: center;
      color: #1e40af;
      font-size: 1rem;
    }
  </style>
</head>
<body>
  <h1>rem + vh demo</h1>
  <div class="panel">height: 30vh — resize the window to see it change</div>
</body>
</html>

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rem and vh Units