window.addEventListener('load', function(){
	// Sub Visual
	const background = document.querySelector('.sub-visual .bg');
  const block = background.querySelector('div');
  const height = background.offsetHeight;

	function parallax(){
    if(this.scrollY < height){
      background.style.marginTop = (this.scrollY / 2.2) + "px";
      block.style.opacity = 1 - (this.scrollY / 650);
    }
  }

  this.addEventListener('scroll', function(){
    parallax();
  });
}, false);