HTML Code

<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

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

  <title>z-index stacking context</title>

  <style>

    body {

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

      padding: 1.5rem;

      color: #334155;

      background: #f8fafc;

    }



    .group-a,

    .group-b {

      position: relative;

      width: 10rem;

      height: 6rem;

      padding: 0.75rem;

      border-radius: 0.35rem;

      color: #fff;

      font-size: 0.8125rem;

    }



    .group-a {

      background: #6366f1;

      z-index: 1;

    }



    .group-b {

      background: #f97316;

      margin-top: -3rem;

      margin-left: 4rem;

      z-index: 2;

    }



    .child-high {

      position: absolute;

      bottom: -1rem;

      right: -1rem;

      width: 5rem;

      height: 3rem;

      background: #22c55e;

      border: 2px solid #fff;

      border-radius: 0.25rem;

      display: grid;

      place-items: center;

      z-index: 999;

    }

  </style>

</head>

<body>

  <h1>Stacking context demo</h1>

  <p>The green box has z-index 999 but stays behind group B because its parent (group A) has a lower stacking context.</p>

  <div class="group-a">

    Group A (z-index: 1)

    <div class="child-high">z-index: 999</div>

  </div>

  <div class="group-b">Group B (z-index: 2)</div>

</body>

</html>

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CSS z-index Property - Stacking Context