How to change the colour (make text "invisible") in a coded block while keeping the navigation link?

My website has three blocks targeting different audiences. Each block has a navigation link, e.g. "For buyers" as pictured in the attached file. However, I want the text to be the same color as the background. When I add a color line to the code, the navigation link code doesn't work any longer.


This is the navigation link code: 

<p id="buyers">  For buyers</p>

How may I change the colour of the text while keeping the navigation link code functional? Thanks so much