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 margin-block-start Compare</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      line-height: 1.6;
      background: #f8fafc;
    }

    .note {
      margin-block-start: 1.5rem;
      padding: 0.75rem;
      background: #eff6ff;
      border: 1px solid #93c5fd;
      border-radius: 0.35rem;
      max-width: 18rem;
      color: #1e3a8a;
    }
  </style>
</head>
<body>
  <h1>Heading above</h1>
  <div class="note">Logical block-start margin</div>
</body>
</html>

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CSS margin-block-start Property - logical vs physical