If you use firefox or chrome, right click on the link and inspect element. You can then use the code inspector to see what line in what css file is applying the color you don’t want.
I recommend not directly editing the woo commerce css and instead setting up overrides in your own style.css as if you were to update woocommerce, it would wipe out your changes. You should be fine to just re-upload your css file with the changes after that, but, if they modified the css in anyway, you’ll lose those edits. Just an FYI.
