Add Class Scrolling

    var hasBeenTrigged = false;
    $(window).scroll(function() {
        if ($(this).scrollTop() >= 150 && !hasBeenTrigged) { // if scroll is greater/equal then 100 and hasBeenTrigged is set to false.
            $('body').addClass('scrolling');
            hasBeenTrigged = true;
        }
        
        if ($(this).scrollTop() < 150 && $('body').hasClass('scrolling')) { // if scroll is greater/equal then 100 and hasBeenTrigged is set to false.
            $('body').removeClass('scrolling');
            hasBeenTrigged = false;
        }
    });