Yes as my topic sais :

Is there a way to attach a different styles.css for newBB depending on the theme a user choses ? Right now the few things that are definded in the styles.css stay the same as the theme searches for the styles.css in its own module folder.
Now is there a way to replace that with a variable that changes according to the theme ?

Or Is there a way to define the few things that are in the NewBBs styles.css in the Themes style.css ?