/* добавить h3→h2/h4→h3 */

.product__section h2 {
    font-size: 18px;
    margin-bottom: 10px;
    font-weight:bold;
    margin-top:20px;
}

.product__section h3 {
    font-size: 13px;
    font-weight: 500;
    margin-bottom: 5px;
}

.action-box h3 {
    display: block;
    text-transform: uppercase;
    font-size: 18px;
    font-weight: bold;
    margin-bottom: 20px;
}