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 isolation Negative Z-Index Example</title>

  <style>

    body {

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

      padding: 1.5rem;

      line-height: 1.6;

      background: #e2e8f0;

    }



    .scene {

      display: flex;

      flex-wrap: wrap;

      gap: 1.5rem;

    }



    .card {

      position: relative;

      width: 200px;

      padding: 1.25rem;

      border-radius: 0.5rem;

      background: #fff;

      border: 2px solid #94a3b8;

      overflow: hidden;

    }



    .card h2 {

      margin: 0 0 0.5rem;

      font-size: 0.95rem;

    }



    .card p {

      margin: 0;

      font-size: 0.85rem;

      color: #475569;

    }



    .card::before {

      content: "";

      position: absolute;

      z-index: -1;

      inset: 0;

      background: linear-gradient(135deg, #fb7185, #fbbf24);

      opacity: 0.85;

    }



    .isolated {

      isolation: isolate;

    }

  </style>

</head>

<body>

  <h1>Contain Negative z-index</h1>

  <div class="scene">

    <div class="card isolated">

      <h2>isolation: isolate</h2>

      <p>The gradient stays behind this card only.</p>

    </div>

    <div class="card">

      <h2>isolation: auto</h2>

      <p>Without isolation, the gradient can slip behind the page background.</p>

    </div>

  </div>

</body>

</html>

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CSS isolation Property - contain negative z-index