I currently have this piece of html which represents the relevant part of my navbar:
In fact, we can simply use the standard bootstrap text colors, instead of hacking the CSS formats.
Standard Color examples: text-primary, text-secondary, text-success, text-danger, text-warning, text-info
In the Navbar code sample bellow, the text Homepage would be in the orange color (text-warning).
Homepage
In the Navbar menu item sample bellow, the text Menu Item would be in the blue color (text-primary).
Menu Item