How to make an unusual page scroll?

Question

JavaScript

Hello. I ask you to suggest the implementation of one little thing.
For example, there are 2 blocks on the page, and you need to make sure that the 2nd block scrolls at a speed 2 times slower than normal.
There is an example: the link below has the same 2nd block:

https://ru.wix.com/website-template/view/html/1928...
Thanks for any help!