Need help with sticky navbar

https://codepen.io/TDuc/pen/abvwKyq
So i try to make the portfolio and i want to use a sticky nav bar.
How can i make the nav bar stick to the welcome section, like remove the space between the navbar and the welcome section?

Hi,

your .welcome-background is pushing on the navbar. I would remove that completely and apply the styling to .content.

Hope this helps.