@media screen and (min-width: 601px) {
    .tp-main h2 {
        font-size: 23px !important;
    }

    .tp-main h3 {
        font-size: 22px !important;
    }

    .tp-main h4,
    .tp-main h5,
    .tp-main h6 {
        font-size: 20px !important;
    }
}

@media screen and (max-width: 600px) {
    .tp-main h2 {
        font-size: 21px !important;
    }

    .tp-main h3 {
        font-size: 20px !important;
    }

    .tp-main h4,
    .tp-main h5,
    .tp-main h6 {
        font-size: 18px !important;
    }
}