html,body{box-sizing:border-box;width:100%;height:100%;margin:0;padding:0}.container{display:flex;justify-content:flex-start;flex-direction:column;align-items:center;width:100%;max-width:480;height:6000px}.container *{position:fixed}img{width:300px;margin-top:75px}.vertical-line{position:fixed;top:320px;width:8px;height:0;background:#000;z-index:0;border-radius:2px;box-shadow:0 0 10px #0000004d;animation:expandLine linear;animation-timeline:scroll(root)}.vertical-line.left{left:calc(50% - 60px)}.vertical-line.right{left:calc(50% + 55px)}@keyframes expandLine{0%{height:0}to{height:100vh}}