Aphrodite is a solution for CSS in JS (learn why you'd want to do that here: http://blog.vjeux.com/2014/javascript/react-css-in-js-nationjs.html). It's distributed on npm (http://npm.im/aphrodite). It has no framework dependencies and generates real CSS.

Author: Kent C. Dodds (https://twitter.com/kentcdodds)
Code: https://esnextb.in/?gist=e64c3bd784af04ac7cb11bf186a59959