How do I adjust second level menu dropdown distance

How do adjust the distance that the second level menu drops down when the browser width becomes smaller than the whole menu width. In other words on mobile device my whole top menu starts to become two or three rows and when you tap top level menu item the dropdown second level menu item shows up to far down the page. I can't figure out where this is set?

Thanks in advance

site:
http://prediktor.azurewebsites.net/solutions-2/