Echo Chen focused on refining the user interface of the element-plus repository, specifically addressing layout inconsistencies in the Upload Drag-and-Drop component. By correcting the el-upload-dragger padding within the Theme-Chalk SCSS files, Echo improved cross-theme visual consistency and reduced layout regressions during drag-and-drop operations. The work involved targeted updates to upload.scss, ensuring that padding values and dragover state visuals aligned with the design system guidelines. Collaborating with a co-author, Echo validated the changes to maintain UI design standards. This contribution demonstrated practical application of CSS, SCSS, and front end development skills, resulting in a more maintainable theme system.