.si-product-picture {
    width: 150px;
    min-height: 150px;
    max-height: 150px;
    overflow: hidden;
}

.si-product-picture-large {
    width: 250px;
    overflow: hidden;
}

    .si-product-picture img {
        width: 150px;
        height: auto;
    }

    .si-product-picture-large img {
        width: 250px;
        height: auto;
    }