fix no bp theme admin bar css

Think I got it: @import "../blogs-mu/_inc/css/custom.css";
Just import a style into the theme style for the admin bar.
Of course it may be overwritten if you update the theme.

I have a couple themes that I would like to install for our members however, the admin bar does not appear correctly. They show up at the bottom of the page.
Is there a simple theme edit fix that can be applied to a theme just to fix the functionality of the admin bar at the top of the page?

Like adding a buddypress css style or something?