Developed and delivered the Tessera theme for the hexojs/site repository, introducing a modern visual baseline through glassmorphism design, responsive layouts, and dark mode support. Focused on front end development and theme integration, the work established a foundation for future design system enhancements and improved branding consistency across site pages. Leveraged skills in responsive design and CSS architecture to ensure adaptability and user engagement on various devices. The implementation utilized YAML for configuration, aligning with project standards and enabling immediate rollout. This contribution provided a scalable theming solution, addressing both current aesthetic needs and long-term maintainability for the site.