Joakim Östlund Andersson enhanced the seb-oss/green repository by implementing size attribute support for the gds-form-control-header within the dropdown component. He applied CSS class-based styling to ensure consistent sizing of both header and footer elements, addressing design-system uniformity and simplifying future styling efforts. Using JavaScript and TypeScript, Joakim also developed automated tests to validate the new sizing behavior and protect against regressions. Although no major bugs were fixed during this period, his work focused on improving UI consistency and test coverage. The changes contributed to more maintainable front-end code and stronger validation practices within the component library.