How Do I Customize Menu Buttons?

Hi support, I was wondering if there was a way to customize the menu buttons. I wanted to highlight my SHOP menu button in a different color, so that it would stand out. So I would like to have all of the other buttons the same color, but to have that one button with a different one. Either to have the LETTERS a different color or the BACKGROUND to that one particular menu button to be a different color. The idea is to draw the persons attention to the shop button. Please share any instructions on how to do this. thank you!