#slider {
  overflow: hidden;
}

#slider figure {
  position: relative;
  width: 500%;
  margin: 0;
  left: 0;
  animation: 20s slider infinite;
}

#slider figure img {
  background: no-repeat;
  max-height: 100vh;
  display: block;
  width: 20%;
  float: left;
}

@keyframes slider {
  0% {
    left: 0;
  }

  20% {
    left: 0;
  }

  25% {
    left: -100%;
  }

  45% {
    left: -100%;
  }

  50% {
    left: -200%;
  }

  70% {
    left: -200%;
  }

  75% {
    left: -300%;
  }

  95% {
    left: -300%;
  }

  100% {
    left: -400%;
  }
}