body{
    background-color: #fff;
}
header .nav li:nth-child(3) a span {
    color: #34A0D5;
    border-bottom: 2px solid #34A0D5;
}
.serviceNav li:nth-child(1) a{
    color: #34A0D5;
}

/*banner开始*/
.banner{
    height: 450px;
    overflow: hidden;
}
.banner .neikuan{
    position: relative;
    height: 100%;
}
.banner img{
    width: 1920px;
    height: 450px;
    position: absolute;
    margin-left: -420px;
}
/*main开始*/
.main section{
    text-align: center;
    margin-bottom: 80px;
}
.main section .title{
    font-size: 40px;
    color: #444;
    font-weight: bold;
    padding: 60px 0;
}
.main .item1 img{
    width: 1080px;
}
.main .item1 .img2{
    margin-top: 60px;
}
.main .item2 img{
    width: 1062px;
    margin-top: 20px;
}
.main .item3 img{
    width: 995px;
}
.main .item4 img{
    width: 1030px;
}