Having trouble figuring out how to change body font color

Hi, hope you are doing well and having a wonderful day.
So, it seems like a silly easy fix but for some reason I'm having a devil of a time trying to change the body font color to black. Every other area seems to work perfectly except that.

Website: http://www.debut-media.com/cavelier/
I've granted access

Can someone please assist.
Thank you so very much.