响应式布局字体大小设置

html {font-size: 62.5%!important; /* 10÷16=62.5% */}
@media only screen and (min-width: 481px){
    html {
        font-size: 94%!important; /* 15.04÷16=94% */
    }
}
@media only screen and (min-width: 561px){
    html {
        font-size: 109%!important; /* 17.44÷16=109% */
    }
}
@media only screen and (min-width: 641px){
    html {
        font-size: 125%!important; /* 20÷16=125% */
    }

}