App.js file after importing Navbar component

App.js

import logo from './logo.svg';
import './App.css';
import {NavBar} from "./ui-components";

function App() {
    return (
        <div className="App">
            <NavBar/>
            <header className="App-header">
                <h1>Car Rental App</h1>
            </header>
        </div>
    );
}

export default App;