.contents {
    margin-top: 300px;
    margin-left: 40px;
}

@media screen and (max-width: 420px) {
    .contents {
        margin-top: 0 !important;
    }
}

@media screen and (max-width: 450px) {
    body .product-info-giftcard {
        top: 240px !important;
    }
}

@media screen and (max-width: 900px) {
    body .product-info-giftcard {
        top: 440px;
    }

    body .purchase-info {
        margin-bottom: 100px;
    }
}