Changing Text Color For Submitting Comments

Here’s the link to my site: https://anarchocapitalism.us/

The problem is in the comments section, I have it set up so people can log in with either WP or Google. If you look at the comment submit form, the colors of the text are hard to see.

Screenshot: https://snag.gy/cCUXb.jpg
Here’s a specific, short post, to help show what I’m talking about if needed. https://ancapus.com/1bedgJ6

So the question of course is how to change the color. Thanks in advance!