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Explain how to prevent global styles pollution

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Add explantion in docs (customize theme) to how to prevent global styles pollution by configuring webpabk.
Based on https://github.com/ant-design/ant-design/issues/4331#issuecomment-391066131
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Arnaud Benhamdine 2018-08-28 15:33:35 +02:00 committed by 偏右
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docs/react/customize-theme.en-US.md
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@ -98,6 +98,27 @@ Another approach to customize theme is creating a `less` file within variables t
Note: This way will load the styles of all components, regardless of your demand, which cause `style` option of `babel-plugin-import` not working.
## How to avoid modifying global styles ?
Currently ant-design modify is designed as a whole experience and modify global styles (eg `body` etc).
If you need to integrate ant-design as a part of a website, perhaps you would want to prevent ant-design to override global styles.
While there's no canonical way to do it, you can take one of the following paths :
### Configuring webpack to scope less files
It's possible to configure webpack to load an alternate less file:
```ts
new webpack.NormalModuleReplacementPlugin( /node_modules\/antd\/lib\/style\/index\.less/, path.resolve(rootDir, 'src/myStylesReplacement.less') ),
Where the src/myStylesReplacement.less file loads the same files as the index.less file, but loads them within the scope of a top-level selector:
#antd { @import '~antd/lib/style/core/index.less'; @import '~antd/lib/style/themes/default.less'; }
```
The result is that all of the "global" styles are being applied with the #antd scope:
## Not working?
You must import styles as less format. A common mistake would be importing multiple copied of styles that some of them are css format to override the less styles.