Help me with my header/navbar

Hello. Can someone help me remove the huge header space/navbar space on the homepage currently preset on this website? Is there a plugin or some CSS code I can use?http://www.88KmH.com

https://imgur.com/a/V5Qhl9H (How i want it to Look vs How it looks)

Thanks!

The page I need help with: [log in to see the link]