css slideshow

* {
  margin: 0;
  padding: 0;
}

.wrap {
  padding: 10px 70px 30px;
  width: 400px;
  position: relative;
  height: 200px;
  text-align: center;
}

.slide {
  width: 400px;
  height: 200px;
  position: relative;
  border: 1px solid #ccc;
}
.slide li {
  list-style: none;
  position: absolute;
  left: 0;
  top: 35px;
  display: inline-block;
  width: 100%;
  height: 100%;
  opacity: 0;
  font: 100px arial helvetica, sans-serif;
}

input,
.label {
  position: relative;
  top: 235px;
  cursor: pointer;
}

input {
  z-index: 2;
  width: 20px;
  height: 20px;
  opacity: 0;
}

.label {
  z-index: 1;
  width: 20px;
  height: 20px;
  background-color: #ccc;
  display: inline-block;
}
.label:first-of-type {
  margin-left: -95px;
}

.next,
.prev {
  position: absolute;
  top: 110px;
  width: 70px !important;
  font-size: 0;
  cursor: pointer;
  color: #555;
}
.next:active,
.prev:active {
  font-size: 30px;
}

.prev {
  left: 15px;
}

.next {
  right: 15px;
}

@keyframes toggle-slide {
  2.5%,
22.5% {
    opacity: 1;
  }
  25%,
100% {
    opacity: 0;
  }
}
@keyframes toggle-ctrl {
  2.5%,
22.5% {
    background-color: #555;
  }
  25%,
100% {
    background-color: #ccc;
  }
}
@keyframes toggle-arrow {
  0%,
24.9975% {
    font-size: 30px;
  }
  25%,
100% {
    font-size: 0;
  }
}
input:active ~ .slide li,
input:active ~ .label,
input:active ~ .prev,
input:active ~ .next {
  animation: none !important;
}

.slide li {
  animation: toggle-slide 12s infinite;
}

.label {
  animation: toggle-ctrl 12s infinite;
}

.prev,
.next {
  animation: toggle-arrow 12s infinite;
}

input:nth-of-type(1):checked ~ .slide li:nth-child(1),
input:nth-of-type(1):checked ~ .label:nth-of-type(1) {
  animation-delay: 0s;
}
input:nth-of-type(1):checked ~ .prev:nth-of-type(8),
input:nth-of-type(1):checked ~ .next:nth-of-type(10) {
  animation-delay: 0s;
}
input:nth-of-type(1):checked ~ .slide li:nth-child(2),
input:nth-of-type(1):checked ~ .label:nth-of-type(2) {
  animation-delay: 3s;
}
input:nth-of-type(1):checked ~ .prev:nth-of-type(5),
input:nth-of-type(1):checked ~ .next:nth-of-type(11) {
  animation-delay: 3s;
}
input:nth-of-type(1):checked ~ .slide li:nth-child(3),
input:nth-of-type(1):checked ~ .label:nth-of-type(3) {
  animation-delay: 6s;
}
input:nth-of-type(1):checked ~ .prev:nth-of-type(6),
input:nth-of-type(1):checked ~ .next:nth-of-type(12) {
  animation-delay: 6s;
}
input:nth-of-type(1):checked ~ .slide li:nth-child(4),
input:nth-of-type(1):checked ~ .label:nth-of-type(4) {
  animation-delay: 9s;
}
input:nth-of-type(1):checked ~ .prev:nth-of-type(7),
input:nth-of-type(1):checked ~ .next:nth-of-type(9) {
  animation-delay: 9s;
}

input:nth-of-type(2):checked ~ .slide li:nth-child(1),
input:nth-of-type(2):checked ~ .label:nth-of-type(1) {
  animation-delay: 9s;
}
input:nth-of-type(2):checked ~ .prev:nth-of-type(8),
input:nth-of-type(2):checked ~ .next:nth-of-type(10) {
  animation-delay: 9s;
}
input:nth-of-type(2):checked ~ .slide li:nth-child(2),
input:nth-of-type(2):checked ~ .label:nth-of-type(2) {
  animation-delay: 0s;
}
input:nth-of-type(2):checked ~ .prev:nth-of-type(5),
input:nth-of-type(2):checked ~ .next:nth-of-type(11) {
  animation-delay: 0s;
}
input:nth-of-type(2):checked ~ .slide li:nth-child(3),
input:nth-of-type(2):checked ~ .label:nth-of-type(3) {
  animation-delay: 3s;
}
input:nth-of-type(2):checked ~ .prev:nth-of-type(6),
input:nth-of-type(2):checked ~ .next:nth-of-type(12) {
  animation-delay: 3s;
}
input:nth-of-type(2):checked ~ .slide li:nth-child(4),
input:nth-of-type(2):checked ~ .label:nth-of-type(4) {
  animation-delay: 6s;
}
input:nth-of-type(2):checked ~ .prev:nth-of-type(7),
input:nth-of-type(2):checked ~ .next:nth-of-type(9) {
  animation-delay: 6s;
}

input:nth-of-type(3):checked ~ .slide li:nth-child(1),
input:nth-of-type(3):checked ~ .label:nth-of-type(1) {
  animation-delay: 6s;
}
input:nth-of-type(3):checked ~ .prev:nth-of-type(8),
input:nth-of-type(3):checked ~ .next:nth-of-type(10) {
  animation-delay: 6s;
}
input:nth-of-type(3):checked ~ .slide li:nth-child(2),
input:nth-of-type(3):checked ~ .label:nth-of-type(2) {
  animation-delay: 9s;
}
input:nth-of-type(3):checked ~ .prev:nth-of-type(5),
input:nth-of-type(3):checked ~ .next:nth-of-type(11) {
  animation-delay: 9s;
}
input:nth-of-type(3):checked ~ .slide li:nth-child(3),
input:nth-of-type(3):checked ~ .label:nth-of-type(3) {
  animation-delay: 0s;
}
input:nth-of-type(3):checked ~ .prev:nth-of-type(6),
input:nth-of-type(3):checked ~ .next:nth-of-type(12) {
  animation-delay: 0s;
}
input:nth-of-type(3):checked ~ .slide li:nth-child(4),
input:nth-of-type(3):checked ~ .label:nth-of-type(4) {
  animation-delay: 3s;
}
input:nth-of-type(3):checked ~ .prev:nth-of-type(7),
input:nth-of-type(3):checked ~ .next:nth-of-type(9) {
  animation-delay: 3s;
}

input:nth-of-type(4):checked ~ .slide li:nth-child(1),
input:nth-of-type(4):checked ~ .label:nth-of-type(1) {
  animation-delay: 3s;
}
input:nth-of-type(4):checked ~ .prev:nth-of-type(8),
input:nth-of-type(4):checked ~ .next:nth-of-type(10) {
  animation-delay: 3s;
}
input:nth-of-type(4):checked ~ .slide li:nth-child(2),
input:nth-of-type(4):checked ~ .label:nth-of-type(2) {
  animation-delay: 6s;
}
input:nth-of-type(4):checked ~ .prev:nth-of-type(5),
input:nth-of-type(4):checked ~ .next:nth-of-type(11) {
  animation-delay: 6s;
}
input:nth-of-type(4):checked ~ .slide li:nth-child(3),
input:nth-of-type(4):checked ~ .label:nth-of-type(3) {
  animation-delay: 9s;
}
input:nth-of-type(4):checked ~ .prev:nth-of-type(6),
input:nth-of-type(4):checked ~ .next:nth-of-type(12) {
  animation-delay: 9s;
}
input:nth-of-type(4):checked ~ .slide li:nth-child(4),
input:nth-of-type(4):checked ~ .label:nth-of-type(4) {
  animation-delay: 0s;
}
input:nth-of-type(4):checked ~ .prev:nth-of-type(7),
input:nth-of-type(4):checked ~ .next:nth-of-type(9) {
  animation-delay: 0s;
}