How to implement floating infinite block animation?

Question

css

Tell me how to implement this kind of animation or poke into the plugin

. The arrows indicate the direction of movement of the blocks. It is necessary that, for example, a block floating up should appear from below. Rummaged through many links, but I can not correctly formulate the request.

Answer 1

Perhaps it will help to understand that in fact these are 3 vertical sliders. All that remains is to make a cyclic automatic scrolling for each of them and choose its direction.