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<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta name="viewport" content="width=device-width, initial-scale=1.0">
  <title>CSS padding-block-start rem Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
    }
    .alert {
      max-width: 20rem;
      padding-inline: 1rem;
      padding-block-start: 1.25rem;
      padding-block-end: 0.75rem;
      background: #fef3c7;
      border: 1px solid #fcd34d;
      border-radius: 0.5rem;
      color: #92400e;
      font-size: 0.9375rem;
    }
  </style>
</head>
<body>
  <h1>rem-Based Block-Start Padding</h1>
  <p class="alert">padding-block-start: 1.25rem scales with the root font size.</p>
</body>
</html>

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CSS padding-block-start Property - rem units