Cabeçalho da Marca fazendo o cabeçalho principal ficar trêmulo ao rolar

[jtbayly]

Mesmo problema discutido (e corrigido) aqui?

How to finely scroll out custom header?

I see the top header of discourse.ubuntu.com and when I scroll down, the extra header smoothly scrolls out. Unlike other discourse forums like: https://talk.turtlerockstudios.com Notice the glitchy behaviour of the top nav. bar Can you provide the HTML and CSS code for the Ubuntu’s forum? with smooth transitioning