They wanted their homepage to look minimalistic yet lively.

As the user scrolls through the home page, the clouds come closer to the user, there is a very cool effect when you are inside the cloud, which should feel like the real thing (or at least what you see when you go through a cloud in an airplane).

It doesn't have any library to get the perspective effect or the parallax effect, everything is done with pure css.

As a reference, the clients said they wanted something very similar to the intro of "The simpsons".