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 z-index Example</title>

  <style>

    body {

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

      padding: 1.5rem;

      color: #334155;

      background: #f8fafc;

    }



    .box {

      position: absolute;

      width: 100px;

      height: 100px;

      opacity: 0.7;

      border-radius: 0.35rem;

    }



    .box1 {

      background-color: #ef4444;

      top: 50px;

      left: 50px;

      z-index: 1;

    }



    .box2 {

      background-color: #22c55e;

      top: 100px;

      left: 100px;

      z-index: 2;

    }



    .box3 {

      background-color: #3b82f6;

      top: 150px;

      left: 150px;

      z-index: 3;

    }

  </style>

</head>

<body>

  <h1>Boxes with Different z-index Values</h1>

  <div class="box box1"></div>

  <div class="box box2"></div>

  <div class="box box3"></div>

</body>

</html>

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CSS z-index Property - Stacked Boxes