字体大小使用 em,
rem
作为单位，然后使用 media query 来调整 html 元素的 font-size
自适应网站
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% */
}
}
app
@media only screen and (min-width: 320px){html {font-size: 62.5%!important;}}
@media only screen and (min-width: 360px){html {font-size: 72.5%!important;}}
@media only screen and (min-width: 400px){html {font-size: 82.5%!important;}}
@media only screen and (min-width: 480px){html {font-size: 94%!important;}}
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