.css .scroller{position:relative;height:100vh;overflow-y:scroll;scroll-behavior:smooth}.first-block{position:sticky;top:0;animation:scrollDown 10s linear infinite}.second-block{position:sticky;top:0;animation:scrollUp 10s linear infinite}@keyframes scrollDown{to{transform:translateY(100%)}}@keyframes scrollUp{to{transform:translateY(-100%)}}