Changing Accordion Header Label's Font Size

Turning the whole freakin’ web upside down, including this page, didn’t yield a solution.
How on earth do you change the font or at least the font size of Accordion’s header (not children)?
From what I understand, sometimes customizing very specific elements of a component requires for it to be dissected at class level. Is this one of those cases?

Has anyone been through this? Help this n00b out please.:crying:
Thank you for your time.