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Fullscreen onepage constant scrolling Lottie Animation

I want to make a simple lottie animation that would follow the user throughout the whole page. This lottie is not like a singular element, but rather changing lines, which depend on the other content of the page.

From the beginning I have a problem that the animation gets cut out, it disappears. I have the fixed position for the div block and I was wondering that perhaps that is the reason, but when I change it to absolute it does not show at all.

Does anyone know how to solve this? I would really appreciate any help or advices

As for this changing lines I mean something like this: and that is why I need lottie to be full width and height

Here is my public share link: [LINK]1
(how to access public share link)