gistfile1.txt

import React from 'react';
import ReactDOM from 'react-dom';
import { BrowserRouter, Switch, Route, Link } from 'react-router-dom';

const NotFound = () => (
  <h1>404 - Page NotFound !</h1>
)

const Home = () => (
  <h1>Home</h1>
)

const About = () => (
  <h1>About</h1>
)

const App = () => (
  <>
    <ul>
      <li>
        <Link to="/">Home</Link>
      </li>
      <li>
        <Link to="/about">About</Link>
      </li>
      <li>
        <Link to="/services">Services</Link>
      </li>
    </ul>
    <Switch>
      <Route path="/" component={Home} />
      <Route path="/about" component={About} />
      <Route component={NotFound} />
    </Switch>
  </>
)

ReactDOM.render(
  <BrowserRouter>
    <App />
  </BrowserRouter>,
  document.getElementById('root')
);