How can i create this kind of scroll animation

I want to know how to make the sliding animation of the sections in de new Chanel website. I don’t know if this is something really simple to do and I’ve just missed it, but I can’t seem to find a way to do it properly

Here’s what I’m trying to reference Fashion shows, Ready-to-wear and Accessories collections - CHANEL

Here is my site Read-Only: LINK
(how to share your site Read-Only link)