css文字循环翻滚动画效果

Hello
world !
bob !
users !
everybody !
源码
<div class="content">
  <div class="content__container">
    <p class="content__container__text">Hello</p>
    <ul class="content__container__list">
      <li class="content__container__list__item">world !</li>
      <li class="content__container__list__item">bob !</li>
      <li class="content__container__list__item">users !</li>
      <li class="content__container__list__item">everybody !</li>
    </ul>
  </div>
</div>

<style>
body {
  width: 100%;
  height: 100%;
  position: fixed;
  background-color: #34495e;
}
.content {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  height: 160px;
  overflow: hidden;
  font-family: "Lato", sans-serif;
  font-size: 35px;
  line-height: 40px;
  color: #ecf0f1;
}
.content__container {
  font-weight: 600;
  overflow: hidden;
  height: 40px;
  padding: 0 40px;
}
.content__container:before {
  content: "[";
  left: 0;
}
.content__container:after {
  content: "]";
  position: absolute;
  right: 0;
}
.content__container:after, .content__container:before {
  position: absolute;
  top: 0;
  color: #16a085;
  font-size: 42px;
  line-height: 40px;
  animation-name: opacity;
  animation-duration: 2s;
  animation-iteration-count: infinite;
}
.content__container__text {
  display: inline;
  float: left;
  margin: 0;
}
.content__container__list {
  margin-top: 0;
  padding-left: 110px;
  text-align: left;
  list-style: none;
  animation-name: change;
  animation-duration: 10s;
  animation-iteration-count: infinite;
}
.content__container__list__item {
  line-height: 40px;
  margin: 0;
}
@keyframes opacity {
  0%, 100% {
    opacity: 0;
  }
  50% {
    opacity: 1;
  }
}
@keyframes change {
  0%, 12.66%, 100% {
    transform: translate3d(0, 0, 0);
  }
  16.66%, 29.32% {
    transform: translate3d(0, -25%, 0);
  }
  33.32%, 45.98% {
    transform: translate3d(0, -50%, 0);
  }
  49.98%, 62.64% {
    transform: translate3d(0, -75%, 0);
  }
  66.64%, 79.3% {
    transform: translate3d(0, -50%, 0);
  }
  83.3%, 95.96% {
    transform: translate3d(0, -25%, 0);
  }
}	
</style>
链接: https://www.fly63.com/course/33_1614