var act = {};
      act.xs = 479;
      act.sm = 767;
      act.md = 1139;
      act.scroll_offset = {
        sm: 66,
        md: 66,
        lg: 66,
        get: function() {
        if(window.matchMedia('(max-width: 767px)').matches) return act.scroll_offset.sm;
        if(window.matchMedia('(min-width: 1140px)').matches) return act.scroll_offset.lg;
        return act.scroll_offset.md;
      },
        set: function(sm, md, lg){
          act.scroll_offset.sm = sm;
          act.scroll_offset.md = md;
          act.scroll_offset.lg = lg;
        }
      };