.slide {
  position   : relative;
  overflow   : hidden;
  width      : 100%;
  aspect-ratio: 8/3;
  margin     : auto;
  background : #fff;
}

.slide img {
  display    : block;
  position   : absolute;
  width      : inherit;
  height     : inherit;
  left       : 100%;
  animation  : slideAnime 15s ease infinite;
}

.slide img:nth-of-type(1) { animation-delay: 0s }
.slide img:nth-of-type(2) { animation-delay: 3s }
.slide img:nth-of-type(3) { animation-delay: 6s }
.slide img:nth-of-type(4) { animation-delay: 9s }
.slide img:nth-of-type(5) { animation-delay: 12s }

@keyframes slideAnime{
   0% { left: 100%  }
   2% { left: 0     }
  20% { left: 0     }
  22% { left: -100% }
 100% { left: -100% }
}