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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>My Page</title>
  <style>
    body {
      font-family: system-ui, -apple-system, sans-serif;
      padding: 2rem;
      background: linear-gradient(135deg, #667eea 0%, #764ba2 100%);
      min-height: 100vh;
    }
    .card {
      background: white;
      padding: 2rem;
      border-radius: 1rem;
      box-shadow: 0 10px 40px rgba(0,0,0,0.2);
    }
    h1 {
      color: #333;
      margin-bottom: 1rem;
    }
    .btn {
      background: #667eea;
      color: white;
      border: none;
      padding: 0.75rem 1.5rem;
      border-radius: 0.5rem;
      cursor: pointer;
      font-weight: 600;
    }
    .btn:hover {
      background: #5568d3;
    }
  </style>
</head>
<body>
  <div class="card">
    <h1>Hello, World!</h1>
    <p>This is a live HTML editor with real-time preview.</p>
    <p>Start editing the code on the left and see changes instantly!</p>
    <br>
    <button class="btn" onclick="alert('Button clicked!')">
      Click Me
    </button>
  </div>

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