http://www.skptricks.com/2018/01/circle-scale-in-and-out-animation-effect-using-css3.html

This post explain how to create circle scale in and out animation effect using css3. Here we are using CSS keyframe property to perform scale in and scale out animation effect. All the animation effect is controlled by Keyframes Rule and it provides very smooth animation effect.
CSS Scale Circle


Lets see the complete example for scale in and scale out animation effect.

http://www.skptricks.com/2018/01/circle-scale-in-and-out-animation-effect-using-css3.html