@media (min-width:1500px) {
    html {
        font-size: 100px;
    }
}

@media (max-width:1500px) and (min-width: 768px) {
    html {
        font-size: calc(100vw /1500 * 100);
    }
}


@media (max-width: 768px) {
    .w1400{width: 94%;}
    html {
        font-size: calc(768px /1500 * 100);
    }
}