客户端 适应不同大小屏幕

@media only screen and (min-320px){
html, body , .content{font-size:15px!important}.viewport{max-320px}
}
@media only screen and (min-360px){
html, body , .content{font-size:25px!important}.viewport{max-360px}
}
@media only screen and (min-480px){
html, body , .content{font-size:30px!important}.viewport{max-480px}
}