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 Zero Example</title>

  <style>

    body {

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

      padding: 1.5rem;

      line-height: 1.6;

    }



    .container {

      position: relative;

      width: 260px;

      height: 180px;

      border: 2px dashed #94a3b8;

      border-radius: 0.35rem;

      background: #f8fafc;

    }



    .header-bar {

      position: absolute;

      inset-inline: 0;

      inset-block-start: 0;

      block-size: 2.5rem;

      background: #2563eb;

      color: #fff;

      display: flex;

      align-items: center;

      justify-content: center;

      font-weight: 600;

      border-radius: 0.35rem 0.35rem 0 0;

    }

  </style>

</head>

<body>

  <h1>Anchor to Block-Start</h1>

  <div class="container">

    <div class="header-bar">Top bar</div>

  </div>

</body>

</html>

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CSS inset-block-start Property - anchor to start