@media screen and (max-width: 599px) {
    h1 {
        font-size: 34px;
    }
}

@media screen and (min-width: 600px) {
    h1 {
        font-size: 48px;
    }
}

@media screen and (min-width: 800px) {
    h1 {
        font-size: 60px;
    }
}