.single-product .variation-selection-error {
    color: #b01f24;
    font-size: 0.9em;
    margin-bottom: 10px;
    display: block;
    clear: both;
}

.single-product .quantity {
    display: inline-block;
    margin-right: 10px;
    vertical-align: top;
}

.single-product .single_add_to_cart_button {
    display: inline-block;
    vertical-align: top;
}

.single-product .single_add_to_cart_button.please-select-options {
    opacity: 0.5;
    cursor: not-allowed;
}