Worked on the lmc-eu/spirit-design-system repository, delivering UI style consistency and accessibility improvements for the web-react package. Focused on unifying class name notation across style props hooks to ensure consistent styling throughout React components, using TypeScript for implementation. Enhanced user feedback and accessibility by introducing a disabled class for the ControlButton in the UNSTABLE_File component when the isDisabled property is true. Developed and executed tests to verify the correct application of these changes, aligning the styling approach with design system guidelines. This work improved maintainability, reduced the risk of UI regressions, and supported faster delivery of future features.