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 $(document).ready(function (){
    var $navbar = $('.navbar');
    var $navbarHeight = $navbar[0].offsetHeight;
    var $body = $('body');

    $body.css('padding-top',$navbarHeight);

    $(window).scroll(function (){
        if($(this).scrollTop() > $navbarHeight ){
            $navbar.addClass('sticky');     
        } else {
            $navbar.removeClass('sticky');
        }
    });
});