scroll to

function scrollTo(element, to, duration) {
    if (duration <= 0) {
        return;
    }
    var difference = to - element.scrollTop;
    var perTick = difference / duration * 10;

    setTimeout(() => {
        element.scrollTop = element.scrollTop + perTick;
        if (element.scrollTop === to) {
            return;
        }
        scrollTo(element, to, duration - 10);
    }, 10);
}