All Text Bold on Site

Hi,
I have been doing work on a site for some time, and had made some changes to the header formatting, changing the size and exterior color. Then I changed it back to plain white.

Somewhere along the way, I did something that changed all the text on the site to bold. I have spent many hours searching forums and code on the site to try and figure out the problem to no avail.

The site is: https://mhcari.org
Arclite theme.

Thank you, any help would be greatly appreciated.

–Heath.