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.product-view-detail .product-img-box .media-left .product-image img {
    /* max-width: 100%; */
    max-width: 65%;
    margin: 0 auto;
    border: 1px solid #f7f7f7;
}



FOR GRANADA THEME:

.product-img-box .product-image {
    max-width: 80%;
    margin: 0 auto;
}