If this was very easy you will find it on my site, but this don't remember nothing for me! :(

https://moiscript.weebly.com/

Ps You have a native dark UI in Moi3D! ;)

And a dark UI by Cody on this page!
https://moiscript.weebly.com/trucs-astuces.html

and a little trick for have a dark UI in Windows! :) (on the same page)