code: function showDownload() {
          window.scrollTo(0, 0);
          var rect = $('.banner canvas')[0].getBoundingClientRect();
  
          tris.forEach(function(tri) {
              tri.shootOff([rect.width / 2, rect.height / 2]);
          });
  
          $('.banner-screen').css({
              opacity: 0,
              transition: 'opacity 1s'
          });
  
          setTimeout(function() {
              $('.download-screen').css({
                  opacity: 1,
                  transition: 'opacity .5s',
                  zIndex: 10,
                  height: rect.height
              });
  
              $('.download-screen .col-sm-6').height(rect.height);
          }, 1000);
  
          if(!running) {
              render();
          }
      }
docs: UI