Magnus Gustafsson enhanced the utily/smoothly repository by focusing on UI theming improvements for the Next Table component. He introduced a configurable CSS variable, --smoothly-table-detail-border, allowing developers to customize border colors for detailed rows and cells, which improved visual clarity and consistency. His approach centralized border styling using CSS and SCSS, aligning the component more closely with the overall design system. This work reduced the effort required for customers to theme and maintain their UI, laying the foundation for broader component theming. Magnus demonstrated strong front-end development skills, emphasizing maintainability and design-system alignment throughout the implementation.