Hello Dfielden,
The change you are requesting is not part of the functionality of BoldGrid. However, it can be done with custom CSS. You will need to either speak with an experienced web developer/designer, or submit a support ticket to BoldGrid.com (click on the link, or go to BoldGrid Central to do this). If they can provide you the solution to add to your Custom CSS section in the BoldGrid Customizer, then they will provide it to you.
If you have any further questions or comments, please let us know.
Kindest regards,
Arnel C.