If you use Internet Explorer, Chrome, Firefox, Safari or Opera you can use the browser’s built-in developer tools to point at and “inspect” elements on a web page to find out what styles they use. You can even tweak the styles live to experiment with any changes you might fancy.
Here you go…
@media screen and (min-width: 768px) {
#MainNav.navRight nav.ubermenu.ubermenu-main { margin-top: 25px }
}
Go to Appearance > Theme Options > Custom CSS and add that CSS to your Custom CSS box. Adjust the top margin to suit your specific situation.