Smooth Scrolling with Sticky Menu
$('a').click(function(e) {
        var target = $(this).attr('href');
        e.preventDefault();

        $('html,body').animate({
            scrollTop: $(target).offset().top
        }, 800, 'easeInOutCirc');
    });

$('html').animate({ // $(document.documentElement) works too
  scrollTop: Math.max($(target).offset().top - $('#your-header').outerHeight(), 0)
}, 800, 'easeInOutCirc');