how to pinch to zoom force on the center

[coddingBoy]

hello. i have the problem that i could not force on the center when i doing zooming. it forces on the bottom of the elem. this is my code.

defaultProps.forEach((val, i) => {
const paris = new ZScroller(this[scroller${i}], {
zooming: true,
minZoom: 1,
onScroll: () => {
const values = paris.scroller.getValues()
zoom = values.zoom
},
})
console.log(paris)
})

are there any params i missed?
thanks