@media only screen and (min-width: 1100px) {
    header h1 {
        font-size: 90px !important;
    }
    header a > div {
        font-size: 60px !important;
    }
} 

@media only screen and (min-width: 1400px) {
    header h1 {
        font-size: 120px !important;
    }
    header a > div {
        font-size: 70px !important;
    }
}