/*.body {
  background: #000;
}*/

.container-sl {
  margin: 50px auto;
  width: 900px;
  height: 500px;
  overflow: hidden;
  border: 10px solid;
  border-top-color: #856036;
  border-left-color: #5d4426;
  border-bottom-color: #856036;
  border-right-color: #5d4426;
  position: relative;
}

.photo {
	position: absolute;
	animation: round 40s infinite;
	opacity: 0;
	background-image: url(Simple%20Image%20Slideshow%20in%20HTML%20&%20CSS/img/8113424031_72048dd887.jpg);
}

@keyframes round {
  25% {
    opacity: 1;
  }
  40% {
    opacity: 0;
  }
}
img:nth-child(1) {
  animation-delay: 36s;
}
img:nth-child(2) {
  animation-delay: 28s;
}
img:nth-child(3) {
  animation-delay:20s;
}

img:nth-child(4) {
  animation-delay: 12s;
}

img:nth-child(5) {
  animation-delay: 6s;
}

img:nth-child(6) {
  animation-delay: 0s;
}