Themes that we use on our forums: https://forum.freecodecamp.org
Both dark and light themes are managed in this repo using different color schemes.
You can learn more about themes in this comprehensive article and learn how to test your changes with theme creator using this article.
Note: The theme plugins (our own and third party) have their own repositories.
Some of the theme plugins we are using as of now are:
You can report any support issues, bugs in our Contributors Chat room or on the main repository's issue tracker.