Cassio modified scroll down distance

var ScrollDown = function () {

  var $el = $('.js-scroll-down');

  if (!$el.length) {
    return;
  }

  $el.on('click', function (e) {

    // this takes into consideration the header height
    // if you'd like you can replace "$('#page-header').height()" with
    // any number in pixels, e.g. "75"
    // Example:
    // var distance = window.innerHeight - 75;
    var distance = window.innerHeight - $('#page-header').height();


    e.preventDefault();

    $('html, body').animate({
      scrollTop: distance
    }, 600, 'swing');

    if (window.SB !== undefined) {

      window.SB.scrollTo(0, distance, 1200, {
        easing: function (pos) {
          if (pos === 0) return 0;
          if (pos === 1) return 1;
          if ((pos /= 0.5) < 1) return 0.5 * Math.pow(2, 10 * (pos - 1));
          return 0.5 * (-Math.pow(2, -10 * --pos) + 2);
        }
      });
    }

  });

};