React Js Display Mouse/Cursor Position on Screen

<!DOCTYPE html>
<html>

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

function App() {
            const [mousePos, setMousePos] = useState({ x: 0, y: 0 });

useEffect(() => {
                const handleMouseMove = (e) =>
                    setMousePos({ x: e.clientX, y: e.clientY });
                document.addEventListener("mousemove", handleMouseMove);
                return () =>
                    document.removeEventListener("mousemove", handleMouseMove);
            }, []);

return (
                <div className='container'>
                    <h3>React Js Display Mouse Position on the Screen</h3>
                    <p>
                        Mouse position: {mousePos.x}, {mousePos.y}
                    </p>
                </div>
            );
        }

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

</style>
</body>

</html>

 
<!DOCTYPE html>
<html>
​
<head>
    <meta charset="UTF-8" />
    <script src="https://unpkg.com/react@17.0.2/umd/react.development.js"></script>
    <script src="https://unpkg.com/react-dom@17.0.2/umd/react-dom.development.js"></script>
    <script src="https://unpkg.com/@babel/standalone@7.14.7/babel.min.js"></script>
</head>
​
<body>
    <div id="app"></div>
    <script type="text/babel">
        const { useState, useEffect } = React;
​
        function App() {
            const [mousePos, setMousePos] = useState({ x: 0, y: 0 });
​
            useEffect(() => {
                const handleMouseMove = (e) =>
                    setMousePos({ x: e.clientX, y: e.clientY });
                document.addEventListener("mousemove", handleMouseMove);
                return () =>
                    document.removeEventListener("mousemove", handleMouseMove);
            }, []);
​
            return (
                <div className='container'>
                    <h3>React Js Display Mouse Position on the Screen</h3>
                    <p>
                        Mouse position: {mousePos.x}, {mousePos.y}
                    </p>
                </div>
            );
        }
​
        ReactDOM.render(<App />, document.getElementById("app"));
    </script>
​
​
    <style>
        .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
        }
​
      
    </style>
</body>
​
</html>