.swiper {
  width: 100%;
  height: 240px;
}
.swiper img {
  -o-object-fit: cover;
     object-fit: cover;
  width: 100%;
  height: 100%;
}
@media (min-width: 640px) {
  .swiper {
    width: 50%;
    height: auto;
  }
}