.swiper-grid-column>.swiper-wrapper {
  flex-wrap: wrap;
  flex-direction: row;
}
.swiperThumbs {
  max-width: 75%;
}
.swiperThumbs .swiper-wrapper {
  height :200px;
}
.swiperThumbs .swiper-slide img {
  margin: 10px;
  display: block;
  width: 80%;
} 

@media screen and (max-width: 768px) {
  .swiperThumbs .swiper-wrapper {
    height :120px;
  }
}