you can add another menu item with the nav-button class to make it look like a button.
If you want that style to be different to the other button then give it a second class eg.
nav-button button-two
We can then use the second class to change the button styles.
To make things a little more complex (sorry ;-)) I want to make the second button less prominent. So the first one has to remain green and I want the second one to have a white background with green text and green border (no hoover effect). Ho do I do this? π