<div>
  <img src='https://images.unsplash.com/photo-1617129724623-84f1d2fd78f3?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=M3wzMjM4NDZ8MHwxfHJhbmRvbXx8fHx8fHx8fDE2OTM5MDAwMjJ8&ixlib=rb-4.0.3&q=80&w=400' alt=''>
  <img src='https://images.unsplash.com/photo-1561037404-61cd46aa615b?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=M3wzMjM4NDZ8MHwxfHJhbmRvbXx8fHx8fHx8fDE2OTM5MDAwMjJ8&ixlib=rb-4.0.3&q=80&w=400' alt=''>
  <img src='https://images.unsplash.com/photo-1544568100-847a948585b9?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=M3wzMjM4NDZ8MHwxfHJhbmRvbXx8fHx8fHx8fDE2OTM5MDAwNzl8&ixlib=rb-4.0.3&q=80&w=400' alt=''>
  <img src='https://images.unsplash.com/photo-1518717758536-85ae29035b6d?crop=entropy&cs=tinysrgb&fit=max&fm=jpg&ixid=M3wzMjM4NDZ8MHwxfHJhbmRvbXx8fHx8fHx8fDE2OTM5MDAxMDJ8&ixlib=rb-4.0.3&q=80&w=400' alt=''>
</div>

div {
  display: flex;
  animation: marquee 16s linear infinite alternate;
}
div:hover {
  animation-play-state: paused;
}

@keyframes marquee {
	0%   { translate: 0; }
	100% { translate: -100%; }
}