.banner{
    width: 100%;
}
.banner img{
    width: 100%;
    margin-top: -4px;
}
.navigationbox{
    border-bottom: 1px solid rgba(240,240,240,1);
    margin-bottom: 110px;
}
.navigation li{
    float: left;
}
.navigation li a{
    font-size: 20px;
    color: #666;
    display: block;
    padding: 20px 60px 20px 0;
}
.navigation .active a{
    color: #333;
}
.title{
    font-size: 32px;
    width: 20%;
    color: #666;
}
.content{
    font-size: 18px;
    color: #666;
    line-height: 40px;
    width: 78%;
}
.textfloat{
    margin-bottom:100px;
}
/* 三张图片弹性盒子 */
.threeimglist{
    display: flex;
    justify-content: space-between;
    margin-bottom: 180px;
}
/* 点击左边纵向按钮切换右边容器内容 */
.switchbox{
    background: url("../images/zn-bj.png") no-repeat center;
    background-size: cover;
}
.switch{
    display: flex;
    margin-bottom: 180px;
}
.btns{
    flex: 1;
    display: flex;
    flex-direction:column;
    align-content: space-between;
}
.btns li{
    flex-grow:1;
    display: flex;
    align-items: center;
    color: #fff;
    font-size: 32px;
    cursor: pointer;
}
.btns li span{
    color: #fff;
    font-size: 32px;
    border-bottom: 3px solid transparent;
}
.btns li .active{
    border-color: #fff;
}
.contimg{
    flex: 2;
}
.flexcontain{
    display: flex;
    flex-wrap: wrap;
}
.flexitem{
    flex-grow: 1;
    width: 50%;
    position: relative;
}
.thirdbox .flexitem{
    width: 100%;
}
.flexitem img{
    width: 100%;
    height: 100%;
}
.flextext{
    font-size: 20px;
    color: #fff;
    padding-left: 20px;
    position: absolute;
    left: 0;
    bottom: 20px;
}