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Scroll animation with stick to top can change color


I want to add a condition animation.

This is a scroll animation, it will add a transparent background to the navbar.

When the view during the center is good, but I want the background color to disappear or change color when the view on the top of the website.

Thanks for any suggestion!

p.s. The share link has a different background but the question is the same.

Here is my public share link: [][1]