html5+css3 手机屏幕的适配css

*{
margin:0;padding:0;outline:0
}
a{
text-decoration:none
}
body,html{
font-size:20px;font-family:'Microsoft YaHei,微软雅黑';height:100%;
}
-webkit-input-placeholder{
color:#ccc
}
::-moz-placeholder{
color:#ccc
}
:-ms-input-placeholder{
color:#ccc
}
input:-moz-placeholder{
color:#ccc
}
html{
font-size:20px;height:100%
}
@media only screen and (min-width:320px) and (min-height:480px){
html{
font-size:20px!important
}
}
@media only screen and (min-width:320px) and (min-height:568px){
html{
font-size:20px!important
}
}
@media only screen and (min-width:360px) and (min-height:640px){
html{
font-size:22.5px!important
}
}
@media only screen and (min-width:375px) and (min-height:667px){
html{
font-size:23.5px!important
}
}
@media only screen and (min-width:414px) and (min-height:736px){
html{
font-size:25.9px!important
}
}
@media only screen and (min-width:736px){
html{
font-size:46px!important
}
}