This text discusses the implementation of dark mode in Sentry's application, which started as a minor hack week project but became a major undertaking. The team aimed to improve their front-end design system by implementing consistent colors and relationships between them. They organized their work into three buckets: cleaning up variables, designing the color system, and creating aliases and refactoring components. Cleaning up variables involved removing redundant and inconsistent color usage, while designing the color system involved creating a unified palette for light and dark modes. Creating aliases and refactoring components required reworking existing code to use new color variables and adjusting styles across different mini-systems of CSS. The process was challenging but ultimately made their designs more consistent, buried "radioactive" styles, and improved relationships between colors.