html,body,div,ul,li,ol,h1,h2,h3,h4,h5,h6,span,input{
  margin:0;padding:0;
}
body{font:12px/1.5em "宋体",arial; color:#3c3c3c;}
h1,h2,h3,h4,h5,h6{font-size::100%;}
img{border:0;display:block;}
ul,ol{list-style::none;}
a{text-decoration:none;color:#fff;
a:hover{text-decoration:underline;}
.clearfix:after{content:"";display:block;height:0;visibility:hidden;clear:both;}
.clearfix{zoom:1;}

html 各个标签初始化