.js-product-price:before {
    content: "от ";
    color: #dd8c56;
    font-size: 20px;
    font-weight: 500;
    padding-right: 2px;
    line-height: 0;
    text-align: center;
    font-family: 'Fira Sans',Arial,sans-serif;
}

@media screen and (max-width: 640px) {
    .js-product-price:before {
        content: "от ";
        color: #dd8c56;
        font-size: 20px;
        font-weight: 500;
        padding-right: 2px;
        line-height: 0;
        text-align: center;
        font-family: 'Fira Sans',Arial,sans-serif;
}