字体图标，标媒体查询

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link rel="stylesheet" href="./黑马/图片/京东/download/font_3459154_oua9l2daqpe/iconfont.css">
    <title>Document</title>
</head>
<style>
    @media (min-width: 1200px) {
        html {
          font-size: 18px;
        }
        span{
          color: red;
        }
      }
      @media (max-width: 720px) {
        html {
          font-size: 16px;
        }
        span{
          color: blue;
        }
      }
      @media (max-width: 640px) {
        html {
          font-size: 14px;
        }
        span{
          color: lightcoral;
        }
      }
      @media (max-width: 480px) {
        html {
          font-size: 12px;
        }
        span{
          color: lightgreen;
        }
      }
  .box{
    width:40rem;
    height:20rem;
    background-color: seagreen;
  }
</style>
<body>
    <div class="box">
        <span class="iconfont icon-huiyuanzhongxin"></span>
    </div>
</body>
</html>
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