<div class="main">
    <div class="d1"></div>
    <div class="d2"</div>
    <div class="d3"></div>
    <div class="d4"></div>
</div>
* {
  margin: 0;
  padding: 0;
  background-color: #2f2f2f;
}
.main {
  height: 100vh;
  width: 100vw;
  position: relative;
}
.d1 {
  position: absolute;
  background-image: url(https://newevolutiondesigns.com/images/freebies/4k-wallpaper-3.jpg);
  background-size: 2700px 1500px;

  height: 30vh;
  width: 15vw;

  background-position: 0 50%;

  box-shadow: 0px 0px 25px rgba(0, 0, 0, 0.8);
  top: 50%;
  transform: translateY(-50%);
  z-index: 2;
  animation: dd1 10s 1, dd12 10s 1;
  animation-delay: 4s, 14s;
}
.d2 {
  position: absolute;
  background-image: url(https://newevolutiondesigns.com/images/freebies/4k-wallpaper-3.jpg);
  background-size: 2700px 1500px;

  height: 50vh;
  width: 25vw;

  background-position: -10vw 50%;
  left: 10vw;

  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
  animation: dd2 10s 2;
  animation-delay: 4s;
}
.d3 {
  position: absolute;
  background-image: url(https://newevolutiondesigns.com/images/freebies/4k-wallpaper-3.jpg);
  background-size: 2700px 1500px;
  overflow: hidden;

  height: 100vh;
  width: 40vw;
  left: 25vw;
  box-shadow: 0px 0px 25px rgba(0, 0, 0, 0.8);
  background-position: -35vw 50%;

  top: 50%;
  transform: translateY(-50%);
  z-index: 3;
  animation: dd3 10s 2;
  animation-delay: 4s;
}
.d4 {
  position: absolute;
  overflow: hidden;
  background-image: url(https://newevolutiondesigns.com/images/freebies/4k-wallpaper-3.jpg);
  background-size: 2700px 1500px;

  height: 80vh;
  width: 25vw;
  left: 60vw;
  background-position: -70vw 50%;

  top: 50%;
  transform: translateY(-50%);
  z-index: 1;
  animation: dd4 10s 2;
  animation-delay: 4s;
}

@keyframes dd1 {
  0% {
  }
  50% {
    width: 95vw;
  }
}
@keyframes dd12 {
  0% {
  }
  50% {
    background-position: Calc(0vw - 40px) 50%;
  }
}
@keyframes dd2 {
  0% {
  }
  50% {
    background-position: Calc(-10vw - 40px) 50%;
  }
}
@keyframes dd3 {
  0% {
  }
  50% {
    background-position: Calc(-35vw - 40px) 50%;
  }
}
@keyframes dd4 {
  0% {
  }
  50% {
    background-position: Calc(-70vw - 40px) 50%;
  }
}
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