Header CSS Question

[PowerWashForum]

Hello,

Can anyone direct me to the part of the Style Variable Editor that controls the little blue boxes that appear around the sign-in area, the "Help" and the "Register" buttons that appear on this page: http://www.powerwash.com/community/forum.php

When someone logs in, the "blue boxes" disappear and the font color looks okay against the white background. But before they log in, the font color is hard to read against the blue backgrounds of the "boxes".

Thank you for any assistance you can give me.