Documentation to build a visual theme?

I’m trying to use the dark theme, but the contrast for words is too low for me. I want to take the dark theme and modify it, but was not able to find documentation on how a theme should be built and loaded, nor how to export the current dark theme.
Could you point me in the right direction?
Thanks!
mario

Almost solved my own question.
Downloaded sources from GitHub, Found Dark.css modified -fx-light-text-color and that’s it! White readable text.
Anyway, this could be documented somewhere.
Thanks!
mario

@mvalle Glad you figured it out.
It’s not yet documented. Feel free to help to improve the documentation.