Heading font color is black in Gutenberg editor, but appears white on webpage

When I edited this page in Gutenberg editor all of the texts of the heading blocks on the page were visible because the font color is set to black, but when I look at the actual webpage outside of Gutenberg the text appears blank because the h2 color for some unexplained reason sets itself to white. I don’t know if this is an issue being caused with the template theme that I am using, but I would like for the text to be visible on the webpage.

The page I need help with: [log in to see the link]