.about-nav{
    text-align: center;
    padding: 20px 0;
    border-bottom: 1px solid #f0f2f5;
}
.about-nav ul li{
    display: inline-block;
    vertical-align: top;
}
.about-nav ul li a{
    display: block;
    padding: 5px 10px;
    font-size: 16px;
    background: #fff;
    border: 1px solid #eee;
    border-radius: 5px;
    margin: 5px 0;
}
.about-nav ul li .active{
    display: block;
    padding: 5px 10px;
    font-size: 16px;
    background: #337ab7;
    border: 1px solid #eee;
    border-radius: 5px;
    color: #fff;
}
.about-nav ul li a:hover{
    display: block;
    padding: 5px 10px;
    font-size: 16px;
    background: #337ab7;
    border: 1px solid #eee;
    border-radius: 5px;
    color: #fff;
}
.con,.case-box{
    width: 100%;
}
.case-box{
    margin-top: 80px;
}
.case-left{
    width: 25%;
    padding: 25px 0 25px 60px;
    background: #efefef;
    float: left;
    color: #12619d;
    margin-top: 280px;
}
.case-left h1{
    font-weight: bold;
    margin-bottom: 0;
}
.case-left p{
    padding: 20px 0 0;
    margin: 0;
}
.case-left .time-hr{
    display: inline-block;
    width: 70px;
    height: 1px;
    background: #cccccc;
    padding: 0;
    margin: 0;
}
.case-right{
    width: 70%;
    margin-right: 5%;
    float: left;
    border: 1px solid #efefef
}
.case-img{
    width: 100%;
    height: 419px;
    overflow: hidden;
}
.case-right img{
    width: 100%;
    cursor: pointer;
}

.case-title{
    padding: 20px 40px;
}
.case-title h4{
    color: #12619d;
    font-size: 22px;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 1;
    -webkit-box-orient: vertical;
}
.case-title p{
    color: #999999;
    overflow: hidden;
    text-overflow: ellipsis;
    display: -webkit-box;
    -webkit-line-clamp: 4;
    -webkit-box-orient: vertical;
}
.news-right-hr{
    display: inline-block;
    width: 70px;
    height: 4px;
    background: #12619d;
    margin: 10px 0;
}
.case-btn{
    display: inline-block;
    padding: 15px 50px;
    border: 1px solid #12619d;
    cursor: pointer;
    color: #12619d;
}
.case-btn:hover{
    display: inline-block;
    padding: 15px 50px;
    border: 1px solid #12619d;
    background: #12619d;
    cursor: pointer;
    color: #fff;
}
@media screen and (max-width: 600px){
    .case-left{
        width: 100%;
        padding: 25px 0;
        margin-top: 0;
        text-align: center;
    }
    .case-img{
        height: auto;
    }
    .case-right{
        width: 100%;
        margin-right: 0;
    }

}