.form-group .form-control[readonly] {
    cursor: pointer;
    background-color: inherit;
    opacity: 1;
    color: #333;
}

#id_price_subtotal[disabled], #id_price_taxes[disabled] {
    font-size: 1em !important;
    color: #000 !important;
}

#id_price_total[disabled] {
    font-size: 1.5em !important;
    color: #000 !important;
}