*{margin: 0;padding: 0;list-style:none;outline: none; }
header{width: 100%;height: 100px;border-bottom:1px solid #c3c3c3;border-top:1px solid #c3c3c3;}
.logo{height: 100px;margin-left: 10%;float: left;}
.dh{width: 80%;margin: 0 auto;font-size: 20px;line-height: 100px;text-align: center;}
.dh li{float: left;margin-left: 10%;width: 12%;color: #000000;}
.dh li:hover{background: #55AAFF;color: #fff;}
.dh a:nth-child(4) li{background: #55AAFF;color: #fff;}
.zhong{width:80%;margin: 50px auto;}
.zuo{width: 40%;float: left;}
.zuo p{line-height: 30px;text-indent: 2em;margin-top: 10px;}
.you{width: 50%;float: right;}

.huiding{width: 8%;position: fixed;bottom: 100px;right: 0;display: none;}