body { font-family: Arial, sans-serif; line-height: 1.6; color: #333; margin: 0; padding: 20px; }
        .email-container { max-width: 600px; margin: 0 auto; border: 1px solid #ddd; }
        .email-header { background: #0073aa; color: white; padding: 20px; text-align: center; }
        .email-content { padding: 20px; background: white; }
        .email-footer { background: #f9f9f9; padding: 15px; text-align: center; font-size: 12px; color: #666; }