@tea-and-crumpets
Footnote:
I’d like to point out that this is already possible, although you’d need CSS knowledge and a third-party extension. The extension is called “Stylus” and it allows you to edit the design of any website. Although, it’s only available for Firefox & Opera. It used to be available on Google Chrome too, however with the release of V3 manifest it was pretty much deprecated from Chrome. This proposal is more or less to port that ability to this website itself, so people don’t have to fiddle around with third-party extensions, oh, and they don’t have to learn CSS, because everything would already be built in.