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 inset-block-start Vertical Example</title>

  <style>

    body {

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

      padding: 1.5rem;

      line-height: 1.6;

    }



    .container {

      position: relative;

      writing-mode: vertical-rl;

      width: 220px;

      height: 220px;

      border: 2px dashed #94a3b8;

      border-radius: 0.35rem;

      background: #f8fafc;

    }



    .box {

      position: absolute;

      inset-block-start: 16px;

      inset-inline-start: 12px;

      inline-size: 3rem;

      block-size: 4rem;

      background: #34d399;

      border-radius: 0.35rem;

    }

  </style>

</head>

<body>

  <h1>Vertical Writing Mode</h1>

  <p>Block-start follows the logical block axis, not always physical top.</p>

  <div class="container">

    <div class="box"></div>

  </div>

</body>

</html>

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CSS inset-block-start Property - vertical writing mode