vm + calc && rem 自适应布局

html {
    font-size: 16px;
}


@media screen and (min-width: 375px) {
    html {
 font-size: calc(100% + 2 * (100vw - 375px) / 39);
 font-size: calc(16px + 2 * (100vw - 375px) / 39);
    }
}



@media screen and (min-width: 414px) {
    html {
 font-size: calc(112.5% + 4 * (100vw - 414px) / 586);
 font-size: calc(18px + 4 * (100vw - 414px) / 586);
    }
}



@media screen and (min-width: 600px) {
    html {
 font-size: calc(125% + 4 * (100vw - 600px) / 400);
 font-size: calc(20px + 4 * (100vw - 600px) / 400);
    }
}


@media screen and (min-width: 1000px) {
    html {
 font-size: calc(137.5% + 6 * (100vw - 1000px) / 1000);
 font-size: calc(22px + 6 * (100vw - 1000px) / 1000);
    }
}