BP_Social theme colours

I've set up my colours in the in the social theme options.

the text in the header is white on a blue background.

It appears that this text colour also sets the text colour of the "Leave Group" button.
My button is white, so I can't see the text and it appears that using css in the child theme wont allow me to change it.
It has "important" written next to it, is this important? : )