.b-tooltip {
    margin: 10px 0;
    font-family: PTSerif-Regular;
    text-align: left;
    font-size: 19px;
    color: #323232;
    letter-spacing: 0;
    line-height: 30px;
}

@media screen and (max-width: 640px) {
    .b-tooltip {
        font-size: 17px;
    }

    .tooltip-text {
        font-size: 17px;
        line-height: 1.35;
        display: block;
        padding: 1.31em 1.21em 1.21em 0;
        color: #323232;
    }
}