There are actually 4 css selectors that can figure in this. Only three of them really matter. If you only have one show on your page, you only need to think about the last two. The selectors are:
The id of the show, #fadeshow1, for example.
.fadeslidedescdiv - the class for all description containers.
.descpanelbg - the class for all description backgrounds.
.descpanelfg - the class for all description foregrounds.