body, div, dl, dt, dd, ul, ol, li, h1, h2, h3, h4, h5, h6, pre, form, fieldset, input, textarea, p, blockquote,table, th, td,iframe,article,aside,canvas,details,figcaption,figure,footer,header,hgroup,menu,nav,section,summary,time,mark,audio,video {
  margin: 0;
  padding: 0;
  font-family: "PingFang SC", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
}
ul, ol {
  list-style: none;
}
a:focus, a:visited, a:active, a:link {
  outline: none;
  text-decoration: none;
}
/*去掉点击页面出现的灰色背景*/
html, body{
  -webkit-text-size-adjust: 100%;
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0);
}