Woodmart teması galiba bu şekilde görmeden yapmak zor ama şunu bir dener misin

form.cart {
    display: flex;
    align-items: center;
    justify-content: space-between;
    flex-wrap: wrap;
}

.woocommerce .single_add_to_cart_button,
form.cart .wd-buy-now-btn {
    flex-basis: calc(50% - 10px);
    max-width: calc(50% - 10px);
    height: 50px;
    text-indent: -9999px;
    overflow: hidden;
    white-space: nowrap;
    margin-bottom: 10px;
    background-size: cover;
    background-position: center center;
}

.woocommerce .single_add_to_cart_button {
    background: url('https://i.hizliresim.com/p5vqcr9.png') no-repeat;
}

form.cart .wd-buy-now-btn {
    background: url('https://i.hizliresim.com/2d9xecm.jpeg') no-repeat;
}

/* Küçük ekranlar için medya sorgusu */
@media only screen and (max-width: 767px) {
    form.cart {
        flex-direction: column;
    }

    .woocommerce .single_add_to_cart_button,
    form.cart .wd-buy-now-btn {
        width: 100%;
        box-sizing: border-box;
        margin-right: 0;
    }
}