If you would ever like to change the color of your categories short description on your website, the best way to do this will be going to your WordPress Admin login from your IO account -> Mega Menu (left hand side) -> Menu Themes -> Menu Bar -> Item Font -> change color. See pictured below for a step-by-step. Once you are done, be sure to save these changes.
You may also have to go into your Categories settings and change the colors in there as well. You will have to highlight the text in your Description and choose the color you'd like to change your font to.