body,button,dd,dl,dt,form,h1,h2,h3,h4,h5,h6,hr,input,li,ol,p,td,textarea,th,ul {
  margin:0;
  padding:0
 }
 
 html,body{
   height: 100%;
   font-family: -apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol
 }
 
 textarea{
   font-family: -apple-system,BlinkMacSystemFont,Segoe UI,PingFang SC,Hiragino Sans GB,Microsoft YaHei,Helvetica Neue,Helvetica,Arial,sans-serif,Apple Color Emoji,Segoe UI Emoji,Segoe UI Symbol
 }
 
 img{border:none;}
 
 ol,ul,li {
  list-style:none
 }
 
 a {
  text-decoration:none
 }