Not strictly a dark theme (it makes other changes as well), but I just uploaded my custom theme if you want to try it out - [forum thread](https://forum.nim-lang.org/t/10748)
- Forum dark theme ML
- Forum dark theme Isofruit
- Forum dark theme krakengore
- Forum dark theme janAkali
- Forum dark theme geotre
- Forum dark theme jasonfi
- Forum dark theme JiyaHana
