css（reset）

*{
margin: 0;
padding: 0;
box-sizing: border-box;
}
body{
font-size: 12px;
font-family:microsoft yahei, 微软雅黑;
width: px;
margin: 0 auto;
}
ul,ol{
list-style: none;
}
a{
text-decoration: none;
}

img{
border: none;
}
.clearfix:after{
content:".";
display:block;
clear:both;
visibility:hidden;
height:0;
}