Function to add velocity to bodies based on scroll speed

file.js

onScroll() {
    this.scrollTimeout = null;

    let delta = (this.lastOffset - window.pageYOffset) * this.options.scrollVelocity;
    this.bodies.forEach((body) => {
        Matter.Body.setVelocity(body, {
            x: body.velocity.x + delta * this.randomize(this.options.xVarianceRange),
            y: body.velocity.y + delta * this.randomize(this.options.yVarianceRange)
        });
    });

    this.lastOffset = window.pageYOffset;
}