body { font-family: Arial, sans-serif; line-height: 1.6; color: #333; }
                .container { max-width: 600px; margin: 0 auto; padding: 20px; }
                .header { background: #4A90E2; color: white; padding: 20px; text-align: center; border-radius: 8px 8px 0 0; }
                .content { background: #f8f9fa; padding: 30px; border-radius: 0 0 8px 8px; }
                .details-box { background: white; padding: 20px; border-radius: 8px; margin: 20px 0; border: 1px solid #e1e8ed; }
                .footer { text-align: center; padding: 20px; color: #7f8c8d; font-size: 12px; }