rem媒体查询

　　

     @media only screen and (min-width: 1080px), only screen and (min-device-width:1080px) {
     html,body {
         font-size:168.75px;
     }
   }
   @media only screen and (max-width: 1080px), only screen and (max-device-width:1080px) {
     html,body {
         font-size:168.75px;
     }
   }
     @media only screen and (max-width: 960px), only screen and (max-device-width:960px) {
     html,body {
         font-size:150px;
     }
   }
     @media only screen and (max-width: 800px), only screen and (max-device-width:800px) {
     html,body {
         font-size:125px;
     }
   }
     @media only screen and (max-width: 720px), only screen and (max-device-width:720px) {
     html,body {
         font-size:112.5px;
     }
   }
     @media only screen and (max-width: 640px), only screen and (max-device-width:640px) {
     html,body {
         font-size:100px;
     }
   }
     @media only screen and (max-width: 600px), only screen and (max-device-width:600px) {
     html,body {
         font-size:93.75px;
     }
   }
     @media only screen and (max-width: 540px), only screen and (max-device-width:540px) {
     html,body {
         font-size:84.375px;
     }
   }
     @media only screen and (max-width: 480px), only screen and (max-device-width:480px) {
     html,body {
         font-size:75px;
     }
   }
     @media only screen and (max-width: 414px), only screen and (max-device-width:414px) {
     html,body {
         font-size:64.6875px;
     }
   }
     @media only screen and (max-width: 400px), only screen and (max-device-width:400px) {
     html,body {
         font-size:62.5px;
     }
   }
     @media only screen and (max-width: 375px), only screen and (max-device-width:375px) {
     html,body {
         font-size:58.59375px;
     }
   }
     @media only screen and (max-width: 360px), only screen and (max-device-width:360px) {
     html,body {
         font-size:56.25px;
     }
   }
     @media only screen and (max-width: 320px), only screen and (max-device-width:320px) {
     html,body {
         font-size:50px;
     }
   }
     @media only screen and (max-width: 240px), only screen and (max-device-width:240px) {
     html,body {
         font-size:37.5px;
     }
   }