.product-quantity {
    flex-wrap: wrap;
}

#opart-add-to-cart-error {
    display: none;
    width: 100%;
    clear: both;
    margin-top: 12px;
}

#opart-add-to-cart-error .alert {
    margin: 0;
    padding: 12px 15px;
    border: 1px solid #e6b8b8;
    background: #f8dddd;
    color: #b04444;
    font-size: 14px;
    line-height: 1.5;
}

#opart-add-to-cart-error ul {
    margin: 0;
    padding-left: 20px;
}