品牌头部在滚动时使主头部变得卡顿

[jtbayly]

与这里讨论（并已修复）的问题相同吗？

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