Cant figure it out. Big usernames in 4.0.X

[Revpolar]

I want to increase the size of the usernames in the postbit or postbit legacy and dont know how. Ive tried to do it in postbit.css but I cant get it to work.

Can anyone tell me where to set the username size at please?

[OurCouponHome]

I'm looking for this too. :)

[Fusion2]

Modify Username HTML Markup under Usergroups

[Lynne]

font size is stylevar mid_fontSize.