I'm pretty new to WordPress and am currently finding my way around customising my Fifteen Theme. I have inspected my site via Firebug, and located CSS lines where I can change the main content background colour from the default grey to white...but when I go to my dashboard>appearance>editer, and try to locate that CSS line in the stylesheet I cant find it...in fact the CSS that comes up on Firebug doesnt appear to be the same generally. Any ideas on what might be wrong or what I need to do? thanks very much!!!