Please visit this link.

Try to click "Portfolio" link, it should be highlighted with blue background.

But after clicking outside the navigation bar it will be highlighted with blue.

    //scrolling
$('nav a').on('click', function() {

    var scrollAnchor = $(this).attr('data-scroll'),
        scrollPoint = $('section[data-anchor="' + scrollAnchor + '"]').offset().top;

    $('body,html').animate({
        scrollTop: scrollPoint
    }, 500);

    return false;

});

//change color
$(window).scroll(function() {
    var windscroll = $(window).scrollTop();
    if (windscroll) {
        $('section').each(function(i) {
            if ($(this).position().top <= windscroll) {
                $('nav a.active').removeClass('active');
                $('nav a').eq(i).addClass('active');
            }
        });

    }
}).scroll();