oh, I see that they have delay too - I knew about angular animations but my problem was that I didn’t know how to add different delay for each element.
All the thing you can imagine you can do it with angular animations, just be creative.
You can define two states, then between that two steps you can define keyframes (like adding steps between father steps) and add to each transition an animation and they are set on a element by class so you can add a diferent delay on each element.