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Centering a fixed div in a section while background scrolls behind it?

I am trying to figure out how I can have an animation or static object fixed to the center of the screen within a section so that it remains fixed while scrolling until I arrive at the end of that section. I don’t have a working example, but can reference something such as the Apple iPad “Learn More” page that features multiple sections with content fixed to the center that remain there while scrolling, until that section ends.

Thanks in advance for any advice that points me to where I can configure this in the application.

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