<div class="view" id="view">
  <div class="inner">
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
    <div class="item"></div>
  </div>
</div>

html,
body {
  margin: 0;
  height: 100%;
  display: grid;
  place-content: center;
}
.view {
  position: relative;
  width: 400px;
  height: 250px;
  counter-reset: num 0;
  animation: scroll 1s infinite;
  overflow: hidden;
}
.view:hover {
  animation-play-state: paused;
}
@keyframes scroll {
  to {
    transform: translateZ(0.1px);
  }
}
.inner {
  display: flex;
  height: 100%;
  transform: translateX(calc(-100% * var(--index, 0)));
  transition: 0.3s;
}
.item {
  width: 100%;
  height: 100%;
  flex-shrink: 0;
  display: grid;
  place-content: center;
  counter-increment: num;
  background-color: blueviolet;
  color: #fff;
  transition: 1s;
  transform: translate3d(0, 0, -100px);
  /* opacity: 0; */
}
.item::after {
  content: counter(num);
  font-size: 60px;
}
.item:nth-child(2n + 1) {
  background: tomato;
}
.item:nth-child(3n + 2) {
  background: royalblue;
}
.item:nth-child(5n + 3) {
  background: violet;
}
.item:nth-child(7n + 4) {
  background: tan;
  color: #333;
}
.item:nth-child(11n + 5) {
  background: yellowgreen;
}

view.addEventListener("animationiteration", () => {
  const index = getComputedStyle(view).getPropertyValue("--index") || 0;
  const len = view.querySelectorAll(".item").length;
  if (index == len - 1) {
    view.style.setProperty("--index", 0);
  } else {
    view.style.setProperty("--index", Number(index) + 1);
  }
});