[diggan]

> How would you implement that scrolling background?

At a glance I'm not sure exactly how I'd implement it, but my guess is that it's possible with some workarounds and hacks, at the very least.

Here's an article showing some demos (at the bottom) on how you can make the mouse cursor affect CSS: https://css-tricks.com/how-to-map-mouse-position-in-css/