Formatting Membership signup form with Buddypress fields added

I've extended the user profiles with Buddypress so that the member adds information when signing up. I need some CSS to get the signup form to display correctly however I'm not sure if it's BuddyPress CSS that I need or Membership CSS? It's really just alignment more than anything.

You can see the field alignment issue here;

I have the Custom CSS plugin installed but could give me a little direction on that? Thanks so much!