How to get button animation on main angular2?

Question

css

So it goes.
Recently, I often see an effect on buttons when hovering / clicking: a circle grows slightly darker / lighter than the button depending on the location of the pointer.
Here is an example - if you click on the button, the above animation will go through.
How to get the effect?

Answer 1

Maybe I misunderstood, but I think it's called ripple . Beautiful demo.