XF 1.5 Styling "New Posts" sidebar to include group colors


I've been trying for a bit to find the property I need to change (or what I need to add) to change the username colors in the "New Posts" sidebar to match the colors that are set in the usergroup styles.

Can anyone point me in the right direction?

P.S. My coding skills are novice at best, so feel free to act like I have no idea what I'm doing ;-)