Board Thread:Support Requests - Designing Your Wiki/@comment-30398052-20170711084723

So, I'm trying to change the layout of my community, but I can't seem to find how to add a picture on the top bar. Overhere it's the one with those people holding their hands in the air. Because I don't know where all the styling possible codes are listed or explained, I just use codes from other wikis and change them to mine wiki. Though, I've still not been able to find out how to add that picture. Is that with CSS?

Also, I see classes and stuff like ".WikiaBlogListingHeader" and ".WikiaBarWrapper", but I've never seen them and I always have to find out myself what they do. I guess there is no help page for those things in community central. But they have to be listed somewhere, how else would you learned how to use CSS on wikia? 