@keyframes drift{0%{visibility:visible;transform:translate3d(var(--start-x),0,0)}to{visibility:visible;transform:translate3d(120vw,0,0)}}.cloud{position:absolute;left:-300px;z-index:5;will-change:transform;visibility:hidden;animation-fill-mode:both}.cloud-1{--start-x: -500px;animation:drift 45s linear infinite;animation-delay:-15s}.cloud-2{--start-x: -450px;animation:drift 65s linear infinite;animation-delay:-25s}.cloud-3{--start-x: -550px;animation:drift 55s linear infinite;animation-delay:-5s}.cloud-4{--start-x: -400px;animation:drift 40s linear infinite;animation-delay:-30s}.cloud-5{--start-x: -350px;animation:drift 70s linear infinite;animation-delay:-40s}