Neumorphism is a design trend which became popular but not yet so much in real life products. We might be seing it in the future.

It basically tries to simulate somewhat a 3d clay organic look. It's mostly used for mobile devices as they lack the tangibility of a laptop or other type of devices which have physical buttons.

This tool generates a very simple css code to simulate it, which comes very handy when translating the designs into HTML/CSS code.