React Js setInterval Method

<html>

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

function App() {
            const [message, setMessage] = useState("");
            const intervalIdRef = useRef(null);

useEffect(() => {
                intervalIdRef.current = setInterval(() => {
                    setMessage(new Date().toLocaleTimeString());
                }, 1000);
                return () => clearInterval(intervalIdRef.current);
            }, []);

return (
                <div class='container'>
                    <h3>React clearInterval Method | Stop interval</h3>
                    <p>{message}</p>
                    <button onClick={() => clearInterval(intervalIdRef.current)}>
                        Stop
                    </button>
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById("app"));
    </script>

h3 {
            font-size: 24px;
            margin-bottom: 10px;
        }

p {
            font-size: 16px;
            margin-bottom: 20px;
        }

button {
            padding: 10px 20px;
            font-size: 16px;
            background-color: #007bff;
            color: #fff;
            border: none;
            border-radius: 4px;
            cursor: pointer;
        }

button:hover {
            background-color: #0056b3;
        }
    </style>
</body>

</html>