# `stylis` Addon Adds [`stylis`](https://github.com/thysultan/stylis.js) pre-processor. This allows you to write CSS as a string using `stylis` syntax everywhere where CSS-like object is expected. ```js const className = nano.rule(` color: red; &:hover { color: blue } `); ``` --- > __Nota Bene__ > > If you use `stylis` pre-processor some other addons may not work with it. --- ## Installation Simply install `stylis` addon. Read more about the [Addon Installation](./Addons.md#addon-installation).