@keyframes slideshow__fade {
  0% {
    opacity: 0;
    z-index: 2;
  }
  6.6666666667% {
    opacity: 1;
  }
  26.6666666667% {
    opacity: 1;
  }
  27.6666666667% {
    opacity: 0;
    z-index: 1;
  }
  100% {
    opacity: 0;
  }
}
.diaporama {
  position: relative;
}
.diaporama img:not(:first-child) {
  position: absolute;
  left: 0;
  top: 0;
  margin: 0 auto;
  animation-duration: 30s; /*On retrouve nos 30 secondes ici */
  animation-fill-mode: both;
  animation-iteration-count: infinite;
  animation-name: slideshow__fade;
  animation-timing-function: ease-in;
  transition: opacity 2s ease-in;
}
.diaporama img:nth-child(1) {
  animation-delay: 0s;
}
.diaporama img:nth-child(2) {
  animation-delay: 6s;
}
.diaporama img:nth-child(3) {
  animation-delay: 12s;
}
.diaporama img:nth-child(4) {
  animation-delay: 18s;
}
.diaporama img:nth-child(5) {
  animation-delay: 24s;
}