So, what I’m trying to achieve is a background that will slowly fill a circle button (or any other) element when I click on it.

Like, when I click the button, I want a darker circle to slowly fill the button from inside out.
Tried to work with @keyframes + animation, but it didn’t work (maybe I did something wrong?)

If I’m not mistaken, a lot of MUi elements have this effect, but I can’t find a way to replicate it on my own.