body {
      font-family: Arial, sans-serif;
      background-color: #f4f4f9;
      color: #333;
      margin: 0;
      padding: 20px;
      display: flex;
      justify-content: center;
      align-items: center;
      height: 100vh;
    }
    h1 {
      text-align: center;
      color: #444;
    }
    .letter-card {
      background: white;
      border-radius: 8px;
      box-shadow: 0 2px 8px rgba(0, 0, 0, 0.1);
      padding: 20px;
      margin: 20px;
      max-width: 600px;
    }
    .letter-card h2 {
      margin: 0;
      color: #444;
    }
    .letter-card p {
      margin: 10px 0;
      line-height: 1.6;
    }
    .letter-card .meta {
      font-size: 0.9em;
      color: #666;
    }