App.js
        mystyle.module.css
index.js
index.html
 
import React from 'react';
import ReactDOM from 'react-dom';
import styles from './mystyle.module.css'; 
class Car extends React.Component {
  render() {
    return <h1 className={styles.bigblue}>Hello Car!</h1>;
  }
}
export default Car;
 
import React from 'react';
import ReactDOM from 'react-dom';
import Car from './App.js';
ReactDOM.render(<Car />, document.getElementById('root'));
 
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="utf-8" />
    <meta name="viewport"
      content="width=device-width, initial-scale=1" />
    <title>React App</title>
  </head>
  <body>
    <div id="root"></div>
  </body>
</html>
 
.bigblue {
  color: DodgerBlue;
  padding: 40px;
  font-family: Arial;
  text-align: center;
}