document.addEventListener('DOMContentLoaded', stickyFooter);
window.addEventListener( 'resize', stickyFooter );
 
function stickyFooter() {
  var footer = document.querySelector('.section:last-child');
  var footerHeight = footer.clientHeight;
  footer.classList.add("sticky-footer");
}

document.addEventListener('DOMContentLoaded',  function() {
  var top = document.getElementById('page-block-nlenxzwi7mo').offsetTop;
  var bottom = document.getElementById('page-block-sc9sr9uc2z').offsetTop;
  window.onscroll = function() {
      var y = (document.documentElement && document.documentElement.scrollTop) || document.body.scrollTop;
      var block = document.getElementById('element-1911').offsetHeight;
      if (y >= top - window.innerHeight && y <= bottom - window.innerHeight + block + 50) {
        document.querySelector('.sticky-footer').classList.add('stick');
      } else {
          document.querySelector('.sticky-footer').classList.remove('stick');
      }
  };
});