Product Landing Page - Stuck in Creating NavBar

Hello, I’m trying to create my first product landing page, the problem is when I create my header for nav-bar, it doesn’t stick to the top, there is a little gap there. Here is my codepen, any help will be appreciated.
Product Landing Page

Oh and feel free to ask me to provide any source necessary.

Hi @mrandi96

Adjust the properties like top and left for #header to be equal to 0 in CSS.

Hey it works, thank you so much @timagixe.