React Js Set Focus on Input field after rendering

<!DOCTYPE html>
<html>

<body>
    <div id="app"></div>
    <script type="text/babel">
        function App() {
            const { useEffect, useRef } = React
            const linkRef = useRef(null);

useEffect(() => {
                if (linkRef.current) {
                    linkRef.current.focus();
                }
            }, []);

return (
                <div className='container'>
                    <h3>React Js set focus link after Rendering</h3>
                    <a ref={linkRef} href="#">My Link</a>
                </div>
            );

}

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

.container h3 {
            color: #333;
            margin-bottom: 10px;
        }

.container a {
            display: block;
            color: #fff;
            background-color: #007bff;
            padding: 10px 15px;
            border-radius: 5px;
            text-decoration: none;
            transition: background-color 0.3s ease;
        }

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

</html>