.page_w{width: 1200px;margin:0 auto;}

.about_toppic{height:500px;width: 100%;background: url(../img/about_topic.jpg) no-repeat top center; }
.content .page_w{width: 990px;}
.about_con{margin-top: 50px;}
.about_con img{vertical-align: top;}
.about_con .txt{line-height: 40px;color: #575757;text-indent: 2em;padding:20px 120px;font-size: 16px;}
.advantage{background: url(../img/about/about_4.jpg) no-repeat top center;width: 840px;height: 206px;padding:0;margin: 0 auto;}
.advantage li{width: 210px;float: left;padding-top: 14px;}
.advantage li p{text-align: center;color: #fff;font-size: 14px;line-height: 22px;height: 22px;}
.advantage li p.title{font-size: 18px;font-weight: bold;height: 60px;;line-height: 60px;}
.advantage li p.mt20{margin-top: 20px;}