Worked on improving front-end theming stability for the compiler-explorer repository, focusing on user experience when system-based theming is enabled. Addressed a persistent issue where users experienced a flash of white during initial page load if their system was set to dark mode. Using JavaScript and CSS, implemented logic to initialize the data-theme attribute based on system preferences, ensuring the correct theme is applied immediately. Enhanced the mapping of theme values such as 'real-dark' and 'onedark' to their corresponding CSS themes, reducing visual inconsistencies. This work improved perceived performance and provided a more consistent interface for users across different environments.