jQuery(document).ready(function($) {

// Add class .fixed when .site-header hits top of viewport

var distance = $('.site-header').offset().top,
    $window = $(window);

$window.scroll(function() {
    if ( $window.scrollTop() >= distance ) {
        $(".site-header").addClass("fixed");
    }
    if ( $window.scrollTop() < distance ) {
        $(".site-header").removeClass("fixed");
    }
});

// Add class .scrolled on scroll to control show/hide of back-top button

$(window).scroll(function() {
    var scroll = $(window).scrollTop();

    if (scroll >= 200) {
        $("body").addClass("scrolled");
    }
    if (scroll <= 200) {
        $("body").removeClass("scrolled");
    }
});

});