...argh. I can't make the developer tools actually edit anything. :( I tried double-clicking on the left side, but all it did was let you change variables that're there - if I tabbed to try and make a new one all it did was highlight. And if I tried to double-click into anything on the left all it did was select the term. And using the gear on the left didn't do anything, I'd input my CSS and hit enter, and it'd just disappear. I also tried putting background-color rule into the console directly, but I just get 'SyntaxError: Parse error'.

I'm probably missing something really simple, but, uh. /o\