text: var a = 0;
  $(window).scroll(function() {
    var oTop = $("#challenges").offset().top - window.innerHeight;
    if (a == 0 && $(window).scrollTop() > oTop) {
      $(".counter-value").each(function() {
        var $this = $(this),
          countTo = $this.attr("data-count");
        $({
          countNum: $this.text()
        }).animate(
          {
            countNum: countTo
          },
  
          {
            duration: 2000,
            easing: "swing",
            step: function() {
              $this.text(Math.floor(this.countNum));
            },
            complete: function() {
              $this.text(this.countNum);
              //alert('finished');
            }
          }
        );
      });
      a = 1;
    }
  });
  