@ionic/core/dist/collection/components/slide/slide.css

Base components for Ionic

ion-slide {
  display: block;
  width: 100%;
  height: 100%;
}

.slide-zoom {
  display: block;
  width: 100%;
  text-align: center;
}

.swiper-slide {
  display: flex;
  position: relative;
  flex-shrink: 0;
  align-items: center;
  justify-content: center;
  width: 100%;
  height: 100%;
  font-size: 18px;
  text-align: center;
  box-sizing: border-box;
}

.swiper-slide img {
  width: auto;
  max-width: 100%;
  height: auto;
  max-height: 100%;
}