*:before,*:after,html,body,a,ul,ol,li,h1,h2,h3,h4,h5,h6,p,div,video,audio,span,em,i,b,strong,s,table,tr,th,td,thead,tbody,tfoot,iframe,img,form,input,textarea,button,select,header,footer,nav,section,br,hr,del,ins,canvas,svg,address{
  box-sizing: border-box;
  -webkit-tap-highlight-color:rgba(0,0,0,0);
  -webkit-tap-highlight-color: transparent;
  outline:none;
  text-decoration: none;
}
html,body{
  margin: 0;
  padding: 0;
  font-family: PingFangSC-Regular, Helvetica, Arial, Microsoft Yahei, sans-serif;
}
a{
  text-decoration: none;
}
a,a:hover,a:active,a:visited,a:link,a:focus,
input, button, textarea, select{
  background: none;
  box-shadow: none;
  -webkit-box-shadow: none;
  border-radius: 0;
  -webkit-border-radius: 0;
  -webkit-appearance: none; 
  -webkit-tap-highlight-color: rgba(0, 0, 0, 0); 
}
input,
button{
  padding: 0;
  margin: 0;
  border: none;
}
button{
  cursor: pointer;
}
ul,li,ol{
  padding: 0;
  margin: 0;
  list-style: none;
}