body {
      font-family: Arial, sans-serif;
      line-height: 1.6;
      margin: 20px;
    }
    h1, h2 {
      color: #003366;
    }
    .message-box {
      border: 1px solid #ccc;
      background-color: #f9f9f9;
      padding: 15px;
      margin: 20px 0;
      border-radius: 8px;
      white-space: pre-line;
    }
    .from-subject {
      background-color: #eef2f7;
      padding: 10px;
      border-left: 4px solid #003366;
      margin-bottom: 10px;
    }
    .highlight {
      font-weight: bold;
      color: #003366;
    }