HTML Code

<!DOCTYPE html>
<html>
<head>
  <title>CSS :empty Skeleton Example</title>
  <style>
    body {
      font-family: system-ui, sans-serif;
      padding: 1.5rem;
    }

    .card {
      max-width: 20rem;
      border: 1px solid #e2e8f0;
      border-radius: 0.75rem;
      overflow: hidden;
    }

    .card-header {
      padding: 0.75rem 1rem;
      background: #f8fafc;
      font-weight: 600;
    }

    .card-body:empty {
      min-height: 6rem;
      background: linear-gradient(90deg, #f1f5f9 25%, #e2e8f0 50%, #f1f5f9 75%);
      background-size: 200% 100%;
      animation: shimmer 1.5s infinite;
    }

    @keyframes shimmer {
      0% { background-position: 200% 0; }
      100% { background-position: -200% 0; }
    }
  </style>
</head>
<body>
  <div class="card">
    <div class="card-header">User Profile</div>
    <div class="card-body"></div>
  </div>
  <p><small>Content will appear here once loaded.</small></p>
</body>
</html>

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CSS :empty Selector - Skeleton Loader