HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :target Modal Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
      color: #334155;
    }

    .open-btn {
      display: inline-block;
      padding: 0.5rem 1rem;
      background: #2563eb;
      color: #fff;
      border-radius: 0.4rem;
      text-decoration: none;
      font-weight: 600;
    }

    .modal {
      display: none;
      position: fixed;
      inset: 0;
      background: rgba(15, 23, 42, 0.6);
      align-items: center;
      justify-content: center;
    }

    .modal:target {
      display: flex;
    }

    .modal-panel {
      background: #fff;
      padding: 1.5rem;
      border-radius: 0.65rem;
      max-width: 18rem;
      text-align: center;
      box-shadow: 0 10px 40px rgba(0, 0, 0, 0.2);
    }

    .modal-panel h2 {
      margin: 0 0 0.5rem;
      font-size: 1.125rem;
    }

    .modal-panel p {
      margin: 0 0 1rem;
      font-size: 0.875rem;
      color: #64748b;
    }

    .close-btn {
      color: #2563eb;
      font-weight: 600;
      text-decoration: none;
    }
  </style>
</head>
<body>
  <a class="open-btn" href="#info-modal">Open Info Modal</a>

  <div id="info-modal" class="modal">
    <div class="modal-panel">
      <h2>Info Modal</h2>
      <p>This panel appears when #info-modal is in the URL. No JavaScript needed!</p>
      <a class="close-btn" href="#">Close</a>
    </div>
  </div>
</body>
</html>

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CSS :target Selector - CSS-Only Modal