Thank you so much, your tips lead me down the right path.
Here is what I used. This works well as any link in nav menu may be made a button.
Edit-Only issue is getting button to display on mobile devices. #mainNavigation div a[href="/application"] {
background: #020079;
color: #fff;
font-size: 15px;
padding: 15px 10px;
border-radius: 30px;
color:white!important; (Added to disable black text on hover)
}