Background images? color schemes? themes?

If you make those sort of changes they probably won’t be supported by Choice of Games.

Personally, I strongly dislike any sort of background image since it makes text unreadable, unless you’re speaking of something neutral like the scroll for Choice of the Dragon.

Start with http://choicescriptdev.wikia.com/wiki/Style.css You may also need to fiddle with the index.html file. I can’t rightly remember.