*{
  box-sizing: border-box;
}
body,div,p,h1,h2,h3,h4,h5,h6,ul,li,dl,dt,a,input,button,textarea,select{
  margin: 0;
  padding: 0;
  outline: none;
}
html,body{
  font-family:Helvetica Neue,Helvetica,Arial,Microsoft Yahei,Hiragino Sans GB,Heiti SC,WenQuanYi Micro Hei,sans-serif;
  color: #333333;
  background-color: #ffffff;
  font-size: 12px;
}
img{
  vertical-align: middle;
  width: 100%;
}
a{
  text-decoration: none;
  color: inherit;
}
ul,li{
  list-style: none;
}
input{
  font: normal;
}
input:focus,a:focus{
  outline: none;
}
.clearfix:after{/*伪元素是行内元素 正常浏览器清除浮动方法*/
  content: "";
  display: block;
  height: 0;
  clear:both;
  visibility: hidden;
}