html { font-size:1px; }
@media(max-width:540px){ html { font-size:0.84375px; } } /*Android常用宽度*/
@media(max-width:480px){ html { font-size:0.8px; } }		/*Android常用宽度*/
@media(max-width:414px){ html { font-size:0.79px; } }  /*i6Plus,i7Plus宽度*/  
@media(max-width:375px){ html { font-size:0.75px; } }	/*i6,i7宽度*/
@media(max-width:360px){ html { font-size:0.74px; } }	/*Android常用宽度*/
@media(max-width:320px){ html { font-size:0.72px; } }		/*i5宽度*/