Worked on the NYCU-Service-Learning/nanao-system repository, delivering a user-facing feature focused on UI and UX enhancements. Developed a responsive home screen using CSS and frontend development techniques, ensuring accessibility across devices. Implemented an in-screen horizontal-scrolling, wrapping dropdown for part selection, which improved usability and readability on smaller viewports. The technical approach emphasized responsive web design and content wrapping to address navigation and onboarding friction. Throughout the process, maintained clear, consumer-focused commit messages for traceability. No bugs were reported during this period, reflecting careful implementation. The work demonstrated practical application of CSS and responsive design principles in a production environment.