RT 𝘾𝙝𝙧𝙞𝙨 𝙎𝙢𝙞𝙩𝙝
New pen: Concave and Convex Curves in CSS
A pen showing how to draw these shapes in CSS and an animation showing how they could potentially be used together.
@CodePen
https://codepen.io/chris22smith/pen/poaeedP

https://twitter.com/chris22smith/status/1526595781708460033