HTML Code

<!DOCTYPE html>

<html lang="ja">

<head>

  <meta charset="UTF-8">

  <meta name="viewport" content="width=device-width, initial-scale=1.0">

  <title>Japanese vertical text</title>

  <style>

    body {

      font-family: "Hiragino Sans", "Yu Gothic", sans-serif;

      padding: 1.5rem;

      color: #334155;

      background: #fff;

    }



    .vertical-block {

      writing-mode: vertical-rl;

      text-orientation: upright;

      height: 14rem;

      padding: 1rem;

      border: 1px solid #cbd5e1;

      border-radius: 0.35rem;

      line-height: 2;

      font-size: 1rem;

    }



    h1 {

      font-family: system-ui, sans-serif;

      font-size: 1.125rem;

      margin-bottom: 1rem;

    }

  </style>

</head>

<body>

  <h1>Japanese vertical layout</h1>

  <p class="vertical-block">

    これは縦書きの段落です。writing-mode と text-orientation を組み合わせて使います。

  </p>

</body>

</html>

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CSS writing-mode Property - Japanese Vertical Text