.product-item-image-wrapper {
    position: relative;
    display: block;
    margin-bottom: 15px;
    padding-top: 116%;
    width: 100%;
    transition: all 300ms ease;
}

.product-item-image-original, .product-item-image-alternative {
    position: absolute;
    top: 0;
    right: 0;
    bottom: 0;
    left: 0;
    display: block;
    width: 100%;
    height: 100%;
    background-position: center;
    background-size: contain;
    background-repeat: no-repeat;
    transition: opacity 300ms linear;
}