text: import './App.css'
  import { BrowserRouter, Link, Route, Switch } from 'react-router-dom'
  import About from './About'
  
  function App() {
    return (
      <div className="App">
        <BrowserRouter>
          <Switch>
            <Route path="/about/:tabId?">
              <About />
            </Route>
            <div>
              <h1>Home</h1>
              <Link to="/about">About</Link>
            </div>
          </Switch>
        </BrowserRouter>
      </div>
    )
  }
  
  export default App
  