react - wyrenderuj element

import React from 'react'
import ReactDOM from 'react'
import { render } from 'react-dom';

class CommentBox extends React.Component {
    render () {
        return (
            <div className = "commentBox">
                hello world
            </div>
        );
    }
}

render(
    <CommentBox/>,
    document.getElementById('content')
);