Just curious – any particular reason why did you choose to use long youtube videos [0] instead of rendering the visualization in-page (with D3 or something)?
[0] https://www.youtube.com/channel/UCnNlEbZNAN06j5IMKLJvkcg/vid...
[0] https://www.youtube.com/channel/UCnNlEbZNAN06j5IMKLJvkcg/vid...
Individual types have player with scrollbar- https://prime-numbers.info/article/semiprimes