How to make custom scrolling on the website?

Hi all, recently I bumped into this websiteand it is very nice scrolling, I climb to his files and found Libu that use.

Of course I immediately went to googol and started looking, came across the IScroll, but when trying to use it, nothing like this has happened, Yes, it moves the content, but so smooth I could not achieve( Maybe someone knows a library which can be used to do the same?
March 23rd 20 at 18:50
2 answers
March 23rd 20 at 18:52
Solution
It is used
March 23rd 20 at 18:54
If you use a plugin for this case, it is better this:
https://kingsora.github.io/OverlayScrollbars/#!overview

It breaks native scrolling algorithms of nowhere (in iOS Safari and Android Chrome you specified the plugin shuts up and sometimes loses focus), can live without jQuery and actively developed.

Here is a table comparing the plugins:
https://kingsora.github.io/OverlayScrollbars/#!faq - burley commented on March 23rd 20 at 18:57

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