Hi Zulf, I love this community too and WordPress.org themes creators like yourself. There must have been an edit in Fleur's message, because when I read it I understood she couldn't find the styles information in the Editor. I hope I haven't misled anybody.
@Fleur17 - sorry, I wasn't aware of the fact that you were looking for the styles information to make changes. I thought you were wondering where that info was, because style.css didn't have it. However, I think it's a good thing to getting to know one's theme, its code structure, its files, where they're located, etc. As for making changes, Zulf's help above is invaluable, and CrouchingBruin's input is the voice of wisdom. I hope I didn't mislead you in any way.