CODE EXAMPLE FOR JAVASCRIPT

how to use css in material ui

import React from 'react';
import Button from '@material-ui/core/Button';
import './PlainCssButton.css';

export default function PlainCssButton() {
  return (
    <div>
      <Button>Default</Button>
      <Button className="button">Customized</Button>
    </div>
  );
}