How to import a CSS file in a React Component

You don't even have to name it if you don't need to:

e.g.

import React from 'react';
import './App.css';

see a complete example here (Build a JSX Live Compiler as a React Component).

You need to use css-loader when creating bundle with webpack.

Install it:

npm install css-loader --save-dev

And add it to loaders in your webpack configs:

module.exports = {
  module: {
    loaders: [
      { test: /\.css$/, loader: "style-loader!css-loader" },
      // ...
    ]
  }
};

After this, you will be able to include css files in js.

I would suggest using CSS Modules:

React

import React from 'react';
import styles from './table.css';

export default class Table extends React.Component {
    render () {
        return <div className={styles.table}>
            <div className={styles.row}>
                <div className={styles.cell}>A0</div>
                <div className={styles.cell}>B0</div>
            </div>
        </div>;
    }
}

Rendering the Component:

<div class="table__table___32osj">
    <div class="table__row___2w27N">
        <div class="table__cell___2w27N">A0</div>
        <div class="table__cell___1oVw5">B0</div>
    </div>
</div>

The following imports an external CSS file in a React component and outputs the CSS rules in the <head /> of the website.

Install Style Loader and CSS Loader:

npm install --save-dev style-loader
npm install --save-dev css-loader

In webpack.config.js:

module.exports = {
    module: {
        rules: [
            {
                test: /\.css$/,
                use: [ 'style-loader', 'css-loader' ]
            }
        ]
    }
}

In a component file:

import './path/to/file.css';

CSS Modules let you use the same CSS class name in different files without worrying about naming clashes.

Button.module.css

.error {
  background-color: red;
}

another-stylesheet.css

.error {
  color: red;
}

Button.js

import React, { Component } from 'react';
import styles from './Button.module.css'; // Import css modules stylesheet as styles
import './another-stylesheet.css'; // Import regular stylesheet
class Button extends Component {
  render() {
    // reference as a js object
    return <button className={styles.error}>Error Button</button>;
  }
}

How to import a CSS file in a React Component

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