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HTML / CSS Editor

<!DOCTYPE html>
<html>
<head>
  <style>
    body {
      font-family: system-ui, sans-serif;
      display: flex;
      flex-direction: column;
      align-items: center;
      justify-content: center;
      min-height: 100vh;
      margin: 0;
      background: linear-gradient(135deg, #6366f1 0%, #a855f7 100%);
      color: white;
    }
    .card {
      background: rgba(255, 255, 255, 0.1);
      backdrop-filter: blur(10px);
      padding: 2rem;
      border-radius: 1.5rem;
      border: 1px solid rgba(255, 255, 255, 0.2);
      box-shadow: 0 25px 50px -12px rgba(0, 0, 0, 0.25);
      text-align: center;
    }
    h1 { margin-top: 0; }
    button {
      background: white;
      color: #6366f1;
      border: none;
      padding: 0.75rem 1.5rem;
      border-radius: 0.75rem;
      font-weight: bold;
      cursor: pointer;
      transition: transform 0.2s;
    }
    button:hover { transform: scale(1.05); }
  </style>
</head>
<body>
  <div class="card">
    <h1>Hello World</h1>
    <p>This is a live HTML preview.</p>
    <button onclick="alert('Magic!')">Click Me</button>
  </div>
</body>
</html>

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