It's called interoperable css [0] or css modules [1]. [0] https://github.com/css-modules/icss https://github.com/css-modules/icss [1] https://github.com/css-m

It's called interoperable css [0] or css modules [1]. [0] https://github.com/css-modules/icss https://github.com/css-modules/icss [1] https://github.com/css-modules/css-modules https://github.com/css-modules/css-modules