HTML Code

<!DOCTYPE html>

<html>

<head>

  <title>CSS border-block-width Vertical Writing</title>

  <style>

    body {

      font-family: sans-serif;

      padding: 1.5rem;

      background: #f8fafc;

    }

    .vertical-panel {

      writing-mode: vertical-rl;

      border-block-width: 6px;

      border-block-style: solid;

      border-block-color: #7c3aed;

      padding: 1rem;

      background: #faf5ff;

      display: inline-block;

      font-weight: 600;

    }

  </style>

</head>

<body>

  <h1>Vertical writing mode</h1>

  <div class="vertical-panel">Vertical block border widths</div>

  <p>Block-start and block-end follow the writing mode.</p>

</body>

</html>

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CSS border-block-width Property - Vertical Writing Mode