.archive-realisation img {
  height: 250px;
  object-fit: cover;
  width: 100%;
  object-position: center;
}
@media (min-width: 768px) {
  .archive-realisation img {
    height: 180px;
  }
}
@media (min-width: 992px) {
  .archive-realisation img {
    height: 300px;
  }
}