html{scroll-behavior:smooth}.parallax-section{position:relative;height:300vh;overflow:hidden}.banner{position:fixed;top:0;left:0;width:100%;height:100vh}.banner img{width:100%;height:100%;object-fit:cover}.banner-1{z-index:10}.banner-2{z-index:20;transform:translateY(100%)}.banner-3{z-index:30;transform:translateY(100%)}