How to scroll up in datatable pagination and stay there

Hi, I have one datatable pagination i have applied following query to scroll up it is going up but after few seconds again coming down

                    dt.on('page.dt', function () {
                        $('html, body').animate({
                            scrollTop: $(".dataTables_wrapper").offset().top
                        }, 'fast');
                    });

this query i m using for scrolling once click on pagination it is going up but again coming down moreover not going complete up some margin left from above in scroll bar