JSFiddle - React, Tailwind, and code Playground

HTML

<ul class="usp__list">
  <li class="usp__item">
    Item 1
  </li>
  <li class="usp__item">
    Item 2
  </li>
  <li class="usp__item">
    Item 3
  </li>
  <li class="usp__item">
    Item 4
  </li>
</ul>

CSS

@keyframes fadein {
  0% {
    opacity: 0;
  }

  66% {
    opacity: 0;
  }

  76% {
    opacity: 1;
  }

  100% {
    opacity: 1;
  }
}

li {
  list-style: none;
  padding: 0;
  font-size: 40px;
  position: absolute;
  width: 100%;
  opacity: 0;
}

li:nth-of-type(1) {
  animation: fadein 6s ease-in-out -4s infinite alternate;
}

li:nth-of-type(2) {
  animation: fadein 6s ease-in-out 0s infinite alternate;
}

li:nth-of-type(3) {
  animation: fadein 6s ease-in-out 4s infinite alternate;
}

li:nth-of-type(4) {
  animation: fadein 6s ease-in-out 8s infinite alternate;
}