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# CSS Modules: Scope Locals & Extend
[](https://travis-ci.org/css-modules/postcss-modules-scope)
Transforms:
```css
:local(.continueButton) {
color: green;
}
```
into:
```css
:export {
continueButton: __buttons_continueButton_djd347adcxz9;
}
.__buttons_continueButton_djd347adcxz9 {
color: green;
}
```
so it doesn't pollute CSS global scope and can be simply used in JS like so:
```js
import styles from "./buttons.css";
elem.innerHTML = `<button class="${styles.continueButton}">Continue</button>`;
```
## Composition
Since we're exporting class names, there's no reason to export only one. This can give us some really useful reuse of styles:
```css
.globalButtonStyle {
background: white;
border: 1px solid;
border-radius: 0.25rem;
}
.globalButtonStyle:hover {
box-shadow: 0 0 4px -2px;
}
:local(.continueButton) {
compose-with: globalButtonStyle;
color: green;
}
```
becomes:
```
.globalButtonStyle {
background: white;
border: 1px solid;
border-radius: 0.25rem;
}
.globalButtonStyle:hover {
box-shadow: 0 0 4px -2px;
}
:local(.continueButton) {
compose-with: globalButtonStyle;
color: green;
}
```
**Note:** you can also use `composes` as a shorthand for `compose-with`
## Local-by-default & reuse across files
You're looking for [CSS Modules](https://github.com/css-modules/css-modules). It uses this plugin as well as a few others, and it's amazing.
## Building
```
npm install
npm test
```
- Status: [](https://travis-ci.org/css-modules/postcss-modules-scope)
- Lines: [](https://coveralls.io/r/css-modules/postcss-modules-scope?branch=master)
- Statements: [](http://codecov.io/github/css-modules/postcss-modules-scope?branch=master)
## Development
- `npm test:watch` will watch `src` and `test` for changes and run the tests
## License
ISC
## With thanks
- Mark Dalgleish
- Tobias Koppers
- Guy Bedford
---
Glen Maddern, 2015.