code: function activeClass() {
        var classes = Glide.settings.classes;
        var slide = Components.Html.slides[Glide.index];
  
        if (slide) {
          slide.classList.add(classes.activeSlide);
  
          siblings(slide).forEach(function (sibling) {
            sibling.classList.remove(classes.activeSlide);
          });
        }
      }
docs: Sets active class to current slide.
  
  @return {Void}