body {
  height: 90vh;
  background: #282c34; // 灰黑色
  font-family: Arial, sans-serif;
  color: #fff;
  font-size: 2.75rem;
  display: flex;
  align-items: center;
  justify-content: center;
}

.container {
  position: relative;
}

.container::before {
  content: "";
  position: absolute;
  width: 100%;
  height: 100%;
  background: #282c34;
  left: 0;
  animation: typewriter 4s steps(23) infinite, blink 1.5s steps(23) infinite;
}

@keyframes typewriter {
  40%,
  60% {
    left: 100%;
  }
  ,
  100% {
    left: 0;
  }
}

@keyframes blink {
  from {
    border-left: solid 1px #fff;
  }
  ,
  to {
    border-left: solid 1px transparent;
  }
}