ie11 background fixed bug

1번
<style>
@media screen and (-ms-high-contrast: active), (-ms-high-contrast: none){
	html{
		overflow: hidden;
		height: 100%;
	}
	body{
		overflow: auto;
		height: 100%;
	}
}
</style>

2번
<script>
if(navigator.userAgent.match(/Trident\/7\./)) {
	document.body.addEventListener("mousewheel", function() {
		event.preventDefault();
		var wd = event.wheelDelta;
		var csp = window.pageYOffset;
		window.scrollTo(0, csp - wd);
	});
}
</script>