我可以在 create-react-app v2 中使用 css 模块覆盖 Material-UI 吗？

Question

For example I want to add margin-top to this button

import classes from 'button.module.css';
        <Button 
          type="submit"
          variant="contained"
          color="primary"
          fullWidth
          disabled={this.props.isLoading}
          className={classes.Button}
        >
          {this.props.isLoading ? <CircularProgress size={20}/> : 'SIGN IN'}
        </Button>

In button.module.css file

.Button {
  margin-top: 15px;
}

Is this possible to use this method instead of override like instruction in official material-ui page?

Answer 1

Yes, you can.

Use className like you normally you do with CRA.

This will explain how to use CSS modules. This is straightforward.

However, after doing the above-mentioned thing, I had an issue of my CSS getting overridden by MaterialUI CSS. So we need to change the order of Styleinjection.

This explains how you can do this.

Here is a sandbox with a working sample.

Answer 2

Simply use StylesProvider component with the injectFirst property:

import React from 'react'
import ReactDOM from 'react-dom'
import App from './App'
import { StylesProvider } from "@material-ui/core/styles" // <-- import this component, and wrap your App.

ReactDOM.render(
    <StylesProvider injectFirst>
        <App />
    </StylesProvider>,
    document.getElementById('root')
)

It's a problem of CSS specificity, in which your CSS is loaded before the Material UI's styles, and therefore is overridden by them. As stated in the docs , regarding the injectFirst property:

By default, the styles are injected last in the element of the page. As a result, they gain more specificity than any other style sheet. If you want to override Material-UI's styles, set this prop.

Answer 3

In my recent project i did things like

import './style.css';

where this is example content of style.css

.detailbox-paper {
  width: 90vw;
  margin: 20px auto 0px auto;
}

where i consumed it by using a className on the element like this <Paper className="detailbox-paper"> and it worked. One thing to keep in mind by this approach, is the css specificity you are then starting to fight with.

You can also use inline styles={{}} with the camelCase syntax for attributes. But, as far as i know, inline styles always will be set, exept there is the !important keyword.

Hopefully this could help you on your journey.