Changing Comment Color (both in-text and on the right side of screen)

Hi! I cannot for the life of me figure out how to change the font color in the bits of text that link to comments. It appears purple (inside the yellow box) and I would like it to be black, since I find the multiple colors distracting. Can anyone help me with this?

Also, is there a way to dim the yellow of the comments to the right (maybe make them white, like the rest of the screen)? Again, I find it taxing on my eyes.

Thanks very much!!