@media (min-width: 340px){
    html {
        font-size: 16px;
    }
}

@media (min-width: 420px){
    html {
        font-size: 24px;
    }
}
@media (min-width: 500px){
    html {
        font-size: 28px;
    }
}
@media (min-width: 740px){
    html {
        font-size: 32px;
    }
}

@media (min-width: 600px){
    html {
        font-size: 30px;
    }
}
@media (min-width: 720px){
    html {
        font-size: 32px;
    }
}

@media (min-width: 1080px){
    html {
        font-size: 44px;
    }
}
@media (min-width: 1280px){
    html {
        font-size: 60px;
    }
}

/* 兼容iphone5 5c 5s*/
@media (device-width: 320px) and (device-height: 568px) and (-webkit-min-device-pixel-ratio: 2.0) {
    html {
        font-size: 15px;
    }
}

/* 兼容iphone6 6s 7 8*/
@media (device-width: 375px) and (device-height: 667px) and (-webkit-min-device-pixel-ratio: 2.0) {
    html {
        font-size: 18px;
    }
}

/* 兼容iphone6p 6sp 7p 8p*/
@media (device-width: 414px) and (device-height: 736px) and (-webkit-min-device-pixel-ratio: 3.0) {
    html {
        font-size: 18px;
    }
}

/* 兼容iphoneX XS*/
@media (device-width: 375px) and (device-height: 812px) and (-webkit-min-device-pixel-ratio: 3.0) {
    html {
        font-size: 18px;
    }
}

/* 兼容iphone XS Max*/
@media (device-width: 414px) and (device-height: 896px) and (-webkit-min-device-pixel-ratio: 3.0) {
    html {
        font-size: 19px;
    }
}

/* 兼容iphone Xr*/
@media (device-width: 414px) and (device-height: 896px) and (-webkit-min-device-pixel-ratio: 2.0) {
    html {
        font-size: 19px;
    }
}