.image-first,
#nega-rok-first {
  width: 341px;
  height: 260px;
}

.images-container {
  height: 260px;
}

@media only screen and (min-width: 600px) {
  .images-container {
    height: 300px;
  }

  .image-first,
  #nega-rok-first {
    width: 393px;
    height: 300px;
  }
}