As clearly mentioned in the customization article, it is clear that changing the initial Add site / Manage account pages styles is not possible through custom css placed on site, but is it possible to do so by editing app files and building it again? If yes, which file contains that information? i'm sorry but i was not able to figure it out. Most articles are outdated and lot has changed in new app.
we are updating the framework used by the App, this is why most of the pages are outdated, until end of May or June we won't have updated documentation.
In any case, the documentation will be generic, not low level detailed with explanations for modifying everything.
Thank you very much Juan. I understand.