Are you using the theme’s built-in page builder? If so, then there should be a way to adjust the font color within the page builder itself. I’m on my phone so I can’t check right now, but according to the documentation, there should be an option to do so at Edit Row > Design > Font Color.
I wasn’t using the page builder. I was using the customizer of the theme. I tried the Page Content color setting.
UPDATE: I was able to change the font within Page Builder. The font color change option also exists within the customizer but it doesn’t seem to work. Maybe a bug? Thanks.