@media screen and (min-width:320px) {

    html {
        font-size: 85.333px !important;
    }
}

@media screen and (min-width:360px) {

    html {
        font-size: 96px !important;
    }
}

/* iphone6的基准 */
@media screen and (min-width:375px) {

    html {
        font-size: 100px !important;
    }
}

@media screen and (min-width:384px) {

    html {
        font-size: 102.4px !important;
    }
}

@media screen and (min-width:400px) {

    html {
        font-size: 106.666px !important;
    }
}

/* iphone 6p */
@media screen and (min-width:414px) {
    html {
        /* 10*414/375=11.04 */
        font-size: 110.4px !important;
    }
}

@media screen and (min-width:424px) {

    html {
        font-size: 113.066px !important;
    }
}

@media screen and (min-width:480px) {

    html {
        font-size: 128px !important;
    }
}

@media screen and (min-width:540px) {

    html {
        font-size: 144px !important;
    }
}

@media screen and (min-width:720px) {

    html {
        font-size: 192px !important;
    }
}

@media screen and (min-width:750px) {

    html {
        font-size: 200px !important;
    }
}

@media screen and (min-width:768px) {

    html {
        /* 10*768/375=20.48 */
        font-size: 204.8px !important;
    }
}