CODE EXAMPLE FOR CSS

change text color when scrolling css

$(document).ready(function(){       
        var scroll_pos = 0;
        $(document).scroll(function() { 
            scroll_pos = $(this).scrollTop();
            if(scroll_pos > 210) {
                $('.hvr-reveal').css('color', '#000');
            } else {
                $('.hvr-reveal').css('color', '#fff');
            }
        });
    });