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

    .row {
      display: flex;
      flex-wrap: wrap;
      gap: 1.5rem;
    }

    .box {
      margin-block-start: 1rem;
      padding: 0.75rem;
      background: #eff6ff;
      border: 2px solid #93c5fd;
      border-radius: 0.35rem;
      font-weight: 600;
      color: #1e3a8a;
    }

    .vertical {
      writing-mode: vertical-rl;
      display: inline-block;
      min-inline-size: 6rem;
    }
  </style>
</head>
<body>
  <h1>Writing Mode Adaptation</h1>
  <div class="row">
    <div>
      <div style="font-size:0.875rem;color:#64748b;">Content above</div>
      <div class="box">Horizontal writing</div>
    </div>
    <div class="vertical">
      <div class="box">Vertical writing</div>
    </div>
  </div>
</body>
</html>

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CSS margin-block-start Property - writing mode