How does Google mobile implement gradient hiding content outside of a block?

Question

css

Hello.
In the mobile version of Google search, bookmarks that don't fit on the screen are styled as fade-outs, making it clear that there are more outside the box.
I am an amateur in these matters, it was not possible to understand how they did it.
Important : I'm interested in exactly the way that was used on this page to implement the hiding gradient

Answer 1

something like this https://codepen.io/anon/pen/yjWEWV/
just look with a touch

Answer 2

Calculate block width, calculate screen width. If the block width is higher than the screen width, then hang the necessary, like a scroll, overflow or slider initialization