Create a Sticky Div When Scrolling

Hello guys!

I am trying to make the contact box div to be always visible as the user scrolls down a page. I have the containing column to be the same height as the one on the left, so that the contact box can slide all the way down inside that column.

I found this link https://css-tricks.com/scrollfollow-sidebar/ and I added the following code for javascript in the layout settings with no luck:

$(function() {

    var $sidebar   = $(".fl-node-569429df64579"),
        $window    = $(".fl-node-56942ec986b7d"),
        offset     = $sidebar.offset(),
        topPadding = 15;

    $window.scroll(function() {
        if ($window.scrollTop() > offset.top) {
            $sidebar.stop().animate({
                marginTop: $window.scrollTop() - offset.top + topPadding
            });
        } else {
            $sidebar.stop().animate({
                marginTop: 0
            });
        }
    });

});

Here is the link of the page: http://weebir.com/preguntas-frecuentes-y-contacto/