HTML Code

<!DOCTYPE html>
<html lang="en">
<head>
  <title>z-index: auto</title>
  <style>
    body {
      font-family: Arial, sans-serif;
      margin: 16px;
      color: #0f172a;
    }

    p {
      margin: 0 0 12px;
      max-width: 40rem;
      line-height: 1.5;
    }

    .stage {
      position: relative;
      width: 260px;
      height: 160px;
    }

    .box {
      position: absolute;
      width: 140px;
      height: 100px;
      display: flex;
      align-items: center;
      justify-content: center;
      font-weight: 700;
      color: #fff;
      border-radius: 8px;
      z-index: auto;
    }

    .first {
      left: 0;
      top: 20px;
      background: #5b21b6;
    }

    .second {
      left: 60px;
      top: 40px;
      background: #0d9488;
    }
  </style>
</head>
<body>
  <p>Both boxes use <strong>z-index: auto</strong>. Later paint order usually puts B on top.</p>
  <div class="stage">
    <div class="box first">A</div>
    <div class="box second">B</div>
  </div>
</body>
</html>

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CSS z-index Property — auto