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How can I replicate the behvaior of this nav bar as seen on Apple's website?

I want to replicate the behavior of this local-nav as seen on Apple’s website. As you’ll notice, when you scroll over a dark section their localnav switches colors. I want to replicate that.

Here is Apple’s page that displays this functionality:

Here you can see this project in read-only:

Here is my public share link: CLICK

Published site:

Hi @fiveatoms,

Seems like you managed, right?

Not quite, when you scroll down the first time, it works decently well. However, when you scroll up, everything goes whack.