How to implement a pulsating animation like on Youtube?

Question

css

How to implement such animation as on Youtube?
Please, take a look on YouTube, when you click on the notification button, there is an animation, and then a block with notifications appears.
Thanks in advance!

Answer 1

Maybe fian.my.id/Waves ?

Answer 2

Place a div with a size of 0 by 0 pixels behind the button. for the div border-radius:50%;opacity:0;.
Then, through javascript on the click event, change the size of the div and the transparency of the background in a loop