Worked on the nextcloud/mail repository, focusing on resolving a plaintext email rendering issue that affected layout consistency across different environments. Addressed a bug where the presence of emoji fonts, specifically Noto Color Emoji, could disrupt the appearance of plaintext emails by adjusting the CSS font rendering order to prioritize sans-serif fonts. This targeted UI improvement enhanced readability and reduced user-facing rendering problems, particularly for users with emoji fonts installed. The solution was implemented using CSS and UI design principles, resulting in a well-documented, isolated change traceable to a single commit, which supports maintainability and straightforward rollback if necessary.