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<!DOCTYPE html>

<html lang="en">

<head>

  <meta charset="UTF-8">

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

  <title>Negative z-index example</title>

  <style>

    body {

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

      padding: 1.5rem;

      line-height: 1.55;

      color: #334155;

      background: #f8fafc;

    }



    .card {

      position: relative;

      max-width: 18rem;

      padding: 1.25rem;

      background: #fff;

      border: 1px solid #cbd5e1;

      border-radius: 0.5rem;

      z-index: 1;

    }



    .card::before {

      content: "";

      position: absolute;

      inset: -0.5rem;

      background: linear-gradient(135deg, #dbeafe, #e9d5ff);

      border-radius: 0.65rem;

      z-index: -1;

    }



    h1 {

      font-size: 1.125rem;

      margin-bottom: 1rem;

    }

  </style>

</head>

<body>

  <h1>Negative z-index</h1>

  <div class="card">

    <h2>Featured card</h2>

    <p>The gradient glow sits behind the card using z-index: -1 on a positioned pseudo-element.</p>

  </div>

</body>

</html>

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CSS z-index Property - Negative z-index