.bt-nav-box{
    width: 1200px;
    min-height: 400px;
    margin: 0 auto;
    position: relative;
    color: #C7C7C7;
    padding:40px 0;
}
.bt-nav-box *{
    font-size:12px;
    color: #C7C7C7;
}
.bt-nav-box a:hover{
    color: #3091F2;
}
.bt-nav-box h1,.bt-nav-box h3,.bt-nav-phone p,.bt-nav-foot_title,.bt-nav-moreInfo{
    color: #FFFFFF;
}
.bt-nav-header{
    overflow: hidden;
}
.bt-nav-phone,.bt-nav-knows{
    float: left;
    left: 0;
}
.bt-nav-phone{
    width: 193px;
    border-right: 1px #575757 solid;
    padding-left:64px;
}
.bt-nav-phone>svg{
    top: 25px;
    position: absolute;
    left: -15px;
}
.bt-nav-phone>p{
    font-size:18px;
    margin-top: 14px;
    margin-bottom: 27px;
}
.bt-nav-phone li{
    margin-bottom: 14px
}
.bt-nav-phone li a{
    font-size: 14px;
}
.bt-nav-knows>li{
    float: left;
}
.bt-nav-knows>li>ul>h3{
    margin-bottom: 30px;
}
.bt-nav-knows>li>ul>li{
    margin-bottom: 15px;
}
.bt-nav-knows_1{
    margin-left: 96px;
}
.bt-nav-knows_2{
    margin-left: 144px;
}
.bt-nav-knows_3{
    margin-left: 142px;
}
.bt-nav-knows_3 .bt-nav-cpy-address{
    display: inline-block;
    vertical-align: top;
}
.bt-nav-knows_4{
    margin-left: 105px;
}
.bt-nav-knows_4 img{
    width:70px;
    height:70px;
    margin: 7px auto;
    display:none;
}
.bt-nav-knows_4>ul>li.active{
    margin-bottom: 0px;
}
.bt-nav-knows_4>ul>li.active>img{
    display:block;
}
.bt-nav-body{
   margin-top: 25px;
}
.bt-nav-body ul{
    overflow: hidden;
    line-height: 24px;
    border-bottom: 1px solid #575757;
}
.bt-nav-body li{
    float:left;
    margin-left:5px;
}
.bt-nav-body li:first-of-type{
    margin-left: 0;
}
.bt-nav-body li img{
    width:24px;
    height:24px;
}
.bt-nav-footer .copyright,.bt-nav-footer .copyright a{
    color:#FFFFFF;
}
.bt-nav-foot_title{
    margin-top: 10px;
}
.bt-nav-fre_link>span{
    display: inline-block;
    margin-right:26px; 
    margin-top: 8px;
}
.bt-nav-footer .copyright{
    margin-top: 40px;
    text-align: center;
}
.bt-nav-footer .copyright img{
    position:relative;
    top:8px;
    width:28px;
    height:28px;
    margin-left: 18px;
}