text: 
  
  
  var lastScrollTop = 0; 
  var delta = 5; 
  var navbarHeight = $('header').outerHeight(); 
    $(window).scroll(function(event){ didScroll = true; }); 
    setInterval(function() { if (didScroll) { hasScrolled(); 
      didScroll = false; } }, 250); function hasScrolled() 
      { var st = $(this).scrollTop(); 
        // Make sure they scroll more than delta 
        if(Math.abs(lastScrollTop - st) <= delta) return; 
        // If they scrolled down and are past the navbar, add class .nav-up. 
        // This is necessary so you never see what is "behind" the navbar. 
        if (st > lastScrollTop && st > navbarHeight){ 
          // Scroll Down 
          $('header').removeClass('nav-down').addClass('nav-up'); } else 
          { 
            // Scroll Up
            if(st + $(window).height() < $(document).height()) 
            { $('header').removeClass('nav-up').addClass('nav-down'); 
          } 
        } lastScrollTop = st; }
  
        $(document).ready(function(){
          $(".hologram-btn").on('click', function(event) {
            if (this.hash !== "") {
              event.preventDefault();
              var hash = this.hash;
              $('html, body').animate({
                scrollTop: $(hash).offset().top
              }, 800, function(){
                window.location.hash = hash;
              });
            } 
          });
        });
        $(document).ready(function(){
          $(".nav").on('click', function(event) {
            if (this.hash !== "") {
              event.preventDefault();
              var hash = this.hash;
              $('html, body').animate({
                scrollTop: $(hash).offset().top
              }, 800, function(){
                window.location.hash = hash;
              });
            } 
          });
        });
        
         