body{
   font-family: "Microsoft YaHei";
}
.content_back{
    width: 1000px;
   /* background: url("../images/back_nav.png");*/
    margin: 0 auto;
    border: 1px solid transparent;
}
.top{
    background: #dbdbdb;
}
.content_back .content{
    width: 970px;
    border: 1px solid #efefef;
    margin:12px  auto 0 auto ;
    background: #fcfcfc;
}

.content_back .content .top .index{
    margin-left: 16px;
    font-size: 15px;
    line-height: 44px;
}