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(function($) {

    // grab the initial top offset of the navigation 
    var sticky_navigation_offset_top = $('.content').offset().top;
    // our function that decides weather the navigation bar should have "fixed" css position or not.
    var sticky_navigation = function(){
        var scroll_top = $(window).scrollTop(); // our current vertical position from the top
        // if we've scrolled more than the navigation, change its position to fixed to stick to top, otherwise change it back to relative
        if (scroll_top > sticky_navigation_offset_top) {     
          $('.nav-right').css('margin-left','100px');
          $('.nav-left').css('margin-right','100px');            
            $('.top-logo').css({'display':'inline-block','transform':'scale(0)'});
            $('.top-logo').fadeIn();
          $('.top-logo').css({'transform':'scale(1)'});
        }else {
          $('.top-logo').fadeOut();
          $('.top-logo').css({'transform':'scale(0)'});
          $('.nav-right').css('margin-left',0);
          $('.nav-left').css('margin-right',0);
        }
    };
    
    if($(window).width()>979) {
        // run our function on load
       sticky_navigation();
        
        // and run it again every time you scroll
        $(window).on('resize scroll', function() {
             sticky_navigation();
        }).resize();
    }
    
})(jQuery);