<div class="gallery">
  <img src="https://picsum.photos/id/1004/400/400" alt="a lovely kiss in the night">
  <img src="https://picsum.photos/id/1013/400/400" alt="a women inside a car">
</div>

.gallery  {
  display: grid;
  width: 220px;
}
.gallery > img {
  grid-area: 1/1;
  width: 100%;
  aspect-ratio: 1;
  object-fit: cover;
  border: 10px solid #f2f2f2;
  box-shadow: 0 0 4px #0007;
  z-index: 2;
}
.gallery img:last-child {
  margin-top: 30px;
  animation: slide 2s linear forwards paused;
}
.gallery:hover img {
  animation-play-state: running;
}

@keyframes slide {
  0% {
    transform: translateX(0%);
    z-index: 2;
  }
  50% {
    transform: translateX(120%);
    z-index: 2;
  }
  50.1% {
    transform: translateX(120%);
    z-index: 1;
  }
  100% {
    transform: translateX(0%);
    z-index: 1;
  }
}


body {
  margin: 0;
  min-height: 100vh;
  display: grid;
  place-content: center;
  background: #CDB380;
  overflow: hidden;
}