window.onscroll = function(ev){
  console.log(ev);
  console.log(window.innerHeight);
  console.log(window.scrollY);
  console.log(page.main.offsetHeight);
  console.log(document.body.offsetHeight);
  if((window.innerHeight+window.scrollY)>= (document.body.offsetHeight-300)){
    console.log('SCROLLING');
  }
}