React Js Detect Internet Connection

<!DOCTYPE html>
<html>

<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState, useEffect } = React;

function App() {
            const [isOnline, setIsOnline] = useState(window.navigator.onLine);

useEffect(() => {
                const handleOnline = () => {
                    setIsOnline(true);
                };

const handleOffline = () => {
                    setIsOnline(false);
                };

window.addEventListener('online', handleOnline);
                window.addEventListener('offline', handleOffline);

// Cleanup event listeners on component unmount
                return () => {
                    window.removeEventListener('online', handleOnline);
                    window.removeEventListener('offline', handleOffline);
                };
            }, []);

return (
                <div className="container">
                    <h3>React Js Detect Internet Connection</h3>
                    {isOnline ? <p>You are online</p> : <p>You are offline</p>}
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>
    <style>
        * {
            box-sizing: border-box;
        }

.container {
            margin: 0 auto;
            width: 600px;
            text-align: center;
            box-shadow: 0 1px 2px 0 rgba(0, 0, 0, 0.12), 0 2px 4px 0 rgba(0, 0, 0, 0.24);
            padding: 20px;
        }

h3 {
            font-size: 24px;
            margin-bottom: 20px;
            color: #333;
        }

p {
            font-size: 18px;
            color: #555;
        }
    </style>
</body>

</html>