Johnson contributed to the nextcloud/mail repository by delivering a refined Email Editor UI with enhanced dark mode support. Focusing on accessibility and usability, Johnson improved CKEditor readability in dark mode, addressed toolbar and color-picker reliability, and implemented better contrast for dropdowns and color inputs. Using Vue.js, JavaScript, and CSS, Johnson stabilized editor controls and tooltips, ensuring consistent behavior across browsers. The work targeted user experience for composing mail, reducing ambiguity in editor interactions and supporting high-contrast settings. This feature release demonstrated depth in front-end development, addressing both visual polish and functional reliability for users relying on accessible email composition.