Helo once again,
Reflux is a great tool for having custom themes in the replit ide.
However, users have to make their own or pick a preset. To solve that, I made Reflux Marketplace. See here Here you can preview themes, as well as copy the code necesary for that theme.
(Also ping me on replit discord (SnowCoder#5223) if you want a Tampermonkey version for any of the themes)