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<h1><small>Fullscreen</small> Ken Burns effect <small>without javascript</small></h1>

<div class="slideshow">
  <div class="slideshow-image" style="background-image: url('https://images.unsplash.com/photo-1497294815431-9365093b7331?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2100&q=80')"></div>
  <div class="slideshow-image" style="background-image: url('https://images.unsplash.com/photo-1626285840323-788f8d8764a5?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2098&q=80')"></div>
  <div class="slideshow-image" style="background-image: url('https://images.unsplash.com/photo-1520338801623-6b88fe32bbf2?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2100&q=80')"></div>
  <div class="slideshow-image" style="background-image: url('https://images.unsplash.com/photo-1625240876684-e86a5bef55d5?ixid=MnwxMjA3fDB8MHxwaG90by1wYWdlfHx8fGVufDB8fHx8&ixlib=rb-1.2.1&auto=format&fit=crop&w=2089&q=80')"></div>
</div>

css

body{background-color: #1F1F1F;overflow: hidden}
.slideshow {
  position: absolute;
  width: 100vw;
  height: 100vh;
  overflow: hidden;
}

.slideshow-image {
  position: absolute;
  width: 100%;
  height: 100%;
  background: no-repeat 50% 50%;
  background-size: cover;
  -webkit-animation-name: kenburns;
          animation-name: kenburns;
  -webkit-animation-timing-function: linear;
          animation-timing-function: linear;
  -webkit-animation-iteration-count: infinite;
          animation-iteration-count: infinite;
  -webkit-animation-duration: 16s;
          animation-duration: 16s;
  opacity: 1;
  transform: scale(1.2);
}
.slideshow-image:nth-child(1) {
  -webkit-animation-name: kenburns-1;
          animation-name: kenburns-1;
  z-index: 3;
}
.slideshow-image:nth-child(2) {
  -webkit-animation-name: kenburns-2;
          animation-name: kenburns-2;
  z-index: 2;
}
.slideshow-image:nth-child(3) {
  -webkit-animation-name: kenburns-3;
          animation-name: kenburns-3;
  z-index: 1;
}
.slideshow-image:nth-child(4) {
  -webkit-animation-name: kenburns-4;
          animation-name: kenburns-4;
  z-index: 0;
}

@-webkit-keyframes kenburns-1 {
  0% {
    opacity: 1;
    transform: scale(1.2);
  }
  1.5625% {
    opacity: 1;
  }
  23.4375% {
    opacity: 1;
  }
  26.5625% {
    opacity: 0;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1.2);
  }
  98.4375% {
    opacity: 0;
    transform: scale(1.2117647059);
  }
  100% {
    opacity: 1;
  }
}

@keyframes kenburns-1 {
  0% {
    opacity: 1;
    transform: scale(1.2);
  }
  1.5625% {
    opacity: 1;
  }
  23.4375% {
    opacity: 1;
  }
  26.5625% {
    opacity: 0;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1.2);
  }
  98.4375% {
    opacity: 0;
    transform: scale(1.2117647059);
  }
  100% {
    opacity: 1;
  }
}
@-webkit-keyframes kenburns-2 {
  23.4375% {
    opacity: 1;
    transform: scale(1.2);
  }
  26.5625% {
    opacity: 1;
  }
  48.4375% {
    opacity: 1;
  }
  51.5625% {
    opacity: 0;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1.2);
  }
}
@keyframes kenburns-2 {
  23.4375% {
    opacity: 1;
    transform: scale(1.2);
  }
  26.5625% {
    opacity: 1;
  }
  48.4375% {
    opacity: 1;
  }
  51.5625% {
    opacity: 0;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1.2);
  }
}
@-webkit-keyframes kenburns-3 {
  48.4375% {
    opacity: 1;
    transform: scale(1.2);
  }
  51.5625% {
    opacity: 1;
  }
  73.4375% {
    opacity: 1;
  }
  76.5625% {
    opacity: 0;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1.2);
  }
}
@keyframes kenburns-3 {
  48.4375% {
    opacity: 1;
    transform: scale(1.2);
  }
  51.5625% {
    opacity: 1;
  }
  73.4375% {
    opacity: 1;
  }
  76.5625% {
    opacity: 0;
    transform: scale(1);
  }
  100% {
    opacity: 0;
    transform: scale(1.2);
  }
}
@-webkit-keyframes kenburns-4 {
  73.4375% {
    opacity: 1;
    transform: scale(1.2);
  }
  76.5625% {
    opacity: 1;
  }
  98.4375% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: scale(1);
  }
}
@keyframes kenburns-4 {
  73.4375% {
    opacity: 1;
    transform: scale(1.2);
  }
  76.5625% {
    opacity: 1;
  }
  98.4375% {
    opacity: 1;
  }
  100% {
    opacity: 0;
    transform: scale(1);
  }
}
h1 {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate3d(-50%, -50%, 0);
  z-index: 99;
  text-align: center;
  font-family: Raleway, sans-serif;
  font-weight: 300;
  text-transform: uppercase;
  background-color: rgba(255, 255, 255, 0.75);
  box-shadow: 0 1em 2em -1em rgba(0, 0, 0, 0.5);
  padding: 1em 2em;
  line-height: 1.5;
}
h1 small {
  display: block;
  text-transform: lowercase;
  font-size: 0.7em;
}
h1 small:first-child {
  border-bottom: 1px solid rgba(0, 0, 0, 0.25);
  padding-bottom: 0.5em;
}
h1 small:last-child {
  border-top: 1px solid rgba(0, 0, 0, 0.25);
  padding-top: 0.5em;
}

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