Lazyloading classes - https://www.shopify.com/partners/blog/lazy-loading

lazyloading-classes.css

.image {
  display: block;
  margin: 0 auto;
  width: 100%;
}

.grid-view-item__image-wrapper .image {
  position: absolute;
  top: 0;
}

.image.lazyload {
  opacity: 0;
}

.image-wrapper {
  margin: 0 auto;
  position: relative;
  width: 100%;
}