[kh99]

Yeah. I mean, of course you wouldn't put it in the middle of another class def, but other than that it doesn't matter.

Edit: just for completeness, you'd add something like this:

.admin_username
{
   color:black; /* or "color:#000000;" , if you'd rather do it like that */
}

probably at the bottom of the additional.css, assuming there's anything in there to start with. Also, that example is just for admin usernames of course - you'd have to create a different class for each usergroup where you wanted to specify a different color.