/* 基础公共样式：清除默认样式 + 设置通用样式 */
* {
    margin: 0;
    padding: 0;
    box-sizing: border-box;
  }
  
  li {
    list-style: none;
  }
  
  body {
    font: 14px/1.5 "Microsoft Yahei", "Hiragino Sans GB", "Heiti SC", "WenQuanYi Micro Hei", sans-serif;
    color: #333;
  }
  
  a {
    color: #333;
    text-decoration: none;
  }