<div class="g-container">
  <ul style="--s: 6">
    <li>Lorem ipsum 1111111</li>
    <li>Lorem ipsum 2222222</li>
    <li>Lorem ipsum 3333333</li>
    <li>Lorem ipsum 4444444</li>
    <li>Lorem ipsum 5555555</li>
    <li>Lorem ipsum 6666666</li>
    <!--末尾补一个首条数据-->
    <li>Lorem ipsum 1111111</li>
  </ul>
</div>

*{
  padding:0;margin:0;
}
li{
  list-style:none;
}

body, html {
  width: 100%;
  height: 100%;
  display: flex;
}

:root {
  --s: 6;
  --h: 36;
  --speed: .8s;
}

.g-container {
  width: 300px;
  margin: auto;
  height: calc(var(--h) * 1px);
  line-height: calc(var(--h) * 1px);
  font-size: 20px;
  background: #673ab7;
  color: #fff;
  overflow: hidden;
}

ul {
  display: flex;
  flex-wrap: nowrap;
  flex-direction: column;
}

ul li {
  flex-shrink: 0;
  width: 100%;
  padding-left: 10px;
  box-sizing: border-box;
}

ul {
  animation: move calc(var(--speed) * var(--s)) steps(var(--s)) infinite;
}

ul li {
  white-space: nowrap;
  cursor: pointer;
  animation: liMove calc(var(--speed)) infinite;
}

@keyframes move {
  0% {
    transform: translate(0, 0);
  }
  100% {
    transform: translate(0, calc(var(--s) * var(--h) * -1px));
  }
}

@keyframes liMove {
  0% {
    transform: translate(0, 0);
  }
  80%,
  100%  {
    transform: translate(0, calc(var(--h) * -1px));
  }
}