.t-store__card__price-value::before, 
.js-product-price::before {
    content: "РРЦ " !important;
    margin-right: 7px;
    display: inline-block;
}

@media screen and (max-width: 1960px) {
    .t-descr_xxs {
        font-size: 16px;
    }
}