Change text color of a hyperlink

Change text color of a hyperlink

I'm making a navigation menu bar. I want it so that one of the href links
can change colors "horizontally", if you know what I mean. Here's an
example:
See how the "Create a Free Account" hyperlink switches from one color to
another? That's what I'm referring to.
If this question sounds a little vague, I'll try to re-word it.