div.galerie.swiper div.swiper-wrapper div.swiper-slide div.img-sizer {
  position: relative;
  padding-bottom: 100%;
}
div.galerie.swiper div.swiper-wrapper div.swiper-slide div.img-sizer img {
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  object-fit: cover;
}