This lesson takes a look at the theming aspect of the [emotion-js](https://emotion.sh/) library. Specifically, we'll walk through the steps of setting up a ReactJS application to use a global theme object which contains our styles. By the end of the lesson, we'll have migrated styled components away from using hard-coded CSS values to instead get access to these values via the `theme` object which the `` component passes down to all of it's children as a `prop`.