function _computeCenterY( element ) {


	const padding = element._padding._value;
	const borderWidth = element._borderWidth._value;

	const topSide = padding.x + borderWidth.x;
	const bottomSide = padding.z + borderWidth.z;

	return ( bottomSide - topSide ) / 2;
}
Retrieve the center Y according to box sized dimensions
@param {MeshUIBaseElement} element
@return {number}