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 border-top-style Vertical Writing Example</title>
  <style>
    body {
      font-family: sans-serif;
      padding: 1.5rem;
      background: #f8fafc;
    }

    .vertical-box {
      writing-mode: vertical-rl;
      display: inline-block;
      border-top-style: solid;
      border-top-width: 4px;
      border-top-color: #059669;
      padding: 0.75rem 1rem;
      background: #ecfdf5;
    }
  </style>
</head>
<body>
  <h1>border-top-style in Vertical Writing</h1>
  <div class="vertical-box">Top border style stays on the physical top</div>
</body>
</html>

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CSS border-top-style Property - Vertical Writing