ReactJS Resize div on drag

<!DOCTYPE html>
<html>

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.1/dist/js/bootstrap.bundle.min.js"></script>

</head>

function App() {
            const [draggable, setDraggable] = useState(false);
            const [resizable1Width, setResizable1Width] = useState(20);

const startDrag = () => {
                setDraggable(true);
                document.addEventListener("mousemove", handleDrag);
                document.addEventListener("mouseup", stopDrag);
            };

const handleDrag = (event) => {
                if (draggable) {
                    const draggableWidth =
                        event.clientX - blockRef.current.getBoundingClientRect().left;
                    const blockWidth = blockRef.current.offsetWidth;
                    const newResizable1Width = (draggableWidth / blockWidth) * 100;
                    setResizable1Width(newResizable1Width.toFixed(2));
                }
            };

const stopDrag = () => {
                setDraggable(false);
                document.removeEventListener("mousemove", handleDrag);
                document.removeEventListener("mouseup", stopDrag);
            };

const blockRef = React.useRef(null);

return (
                <div className='container'>
                    <h3>ReactJS Resize div on drag and drop</h3>
                    <div className="Block" ref={blockRef}>
                        <div
                            id="Resizable1"
                            style={{ width: `${resizable1Width}%`, backgroundColor: "#C51162" }}
                            className="ResizableBlock"
                        ></div>
                        <div
                            id="Draggable"
                            draggable="true"
                            onMouseDown={startDrag}
                            className="Draggable"
                        ></div>
                        <div
                            id="Resizable2"
                            style={{
                                width: `${100 - resizable1Width}%`,
                                backgroundColor: "#AA00FF"
                            }}
                            className="ResizableBlock"
                        ></div>
                    </div>
                </div>
            );
        }

ReactDOM.render(<App />, document.getElementById('app'));
    </script>
    <style>
        .container {
            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);
            width: 600px;
            margin: 0 auto;
            padding: 20px;
        }

.Block {
            display: flex;
            align-items: center;
        }

.ResizableBlock {
            border: 1px solid black;
            height: 200px;
        }

.Draggable {
            background: rgba(1, 1, 1, 0.2);
            border-bottom: 1px solid black;
            border-right: 1px solid black;
            border-top: 1px solid black;
            cursor: col-resize;
            height: 200px;
            width: 10px;
        }
    </style>
</body>

</html>