Animation/parallax – an example shown

Hi there,

I’ve seen this cool animation/parallax on this site: https://chaya.si/

You see it below – the moon goes up etc.

Now, my idea is they are using the revolution slider and the parallax feature. However, if you check it out, you see that the moon slowly stops moving once you stop scrolling down. It seems like an animation > the moon doesn’t just immediately stop.

Does anyone have any ideas how this is done?

Thanks in advance,
G