.nav_top{
    width:1200px;
    position:absolute;
    left:50%;
    top:0;
    z-index:2;
    margin-left:-600px;
}
.lbtn{
    float:left;
    width:165px;
    height:70px;
    background:url(../image/logo.png) no-repeat;
}
.rbtn{
    float:right;
}
.rbtn ul{
    float:left;
}
.linea{
    float:left;
    height:20px;
    border-left:2px solid #cfd1c8;
    margin:25px 0 25px 12px;
}
.rbtn ul li{
    float:left;
    padding:17px 0;
}
.rbtn ul li a{
    display:block;
    height:32px;
    line-height:32px;
    padding:0 20px;
    color:#fff;
    font-size:19px;
    border:2px solid transparent;
    border-radius:17px;
}
.rbtn ul li a.active{
    border-color:#ffc200;
}
.rbtn ul li a:hover{
    color:#ffc200;
}
.twitter{
    float:left;
    width:20px;
    height:70px;
    background:url(../image/weibo.png) no-repeat center;
    margin:0 10px 0 12px;
}
.twitter a,.lettera a{
    display:block;
    width:100%;
    height:100%;
}
.lettera{
    float:left;
    width:20px;
    height:70px;
    background:url(../image/weixin.png) no-repeat center;
    margin:0 10px 0 12px;
}