Hi, I recently made a dark theme for TOKI's coding platform, TLX.
I did not simply use a color inverter for better results. I also added a copy button to the samples.
You can find it at my GitHub repo (along with the installation instruction). The script is new so there might be some bugs. Feel free to report a bug or giving any suggestions by opening an issue at the repo :)
There might be some bugs with the Latex and I am fixing it right now.
Special thanks to sigma_g for guiding me. Check out his awesom dark theme for codeforces