Recompile CSS

Hello guys.

I’d changed some scss files, but it seems to do nothing. Guess i have to recompile the css’s, but i can’t find out how. Any help?

Also, we are having the problem that in every Major upgrade we have to redevelop (so to speak) these “look and feel” changes, and apply them. So its like starting on over every upgrade. If anyone has had this problem, or has a method or technice to avoid this re-work, i would love to read about it.

Thanks in advance.

Cheers from Uruguay