We have created a Luma child theme, and trying to figure out, how to make some CSS-changes?! For instance, change the footer and header background color? The _extend.less doesn't work, and adding a custom css-file to include on all pages, doesn't work either. The first problem, is to find the class somewhere. Anybody who can shed some light on this, just to get us started, if that simple?
Thanks in advance,