lordfrontend/src/routes/notfound.js

import React from 'react';
import Navbar from '../Navbar';

class NotFound extends React.Component {
    render() {
        return (
            <>
                <Navbar brand="404" />
                <div><h1>I MEME 404</h1></div>
            </>
        );
    }
}

export default NotFound;