There's a ton of interest these days in 'CSS in JS'. The premise is simple: CSS operates in a global namespace, which can result in undesirable side effects, spaghetti code, and extremely difficult to maintain codebases. JavaScript used to do this, and we fixed it by encapsulating everything in modules and using tools like webpack to stitch everything together. And hey look, our JavaScript tools can handle CSS too, why don't we move all of our CSS into JavaScript and encapsulate everything by module!