body{
    background-color: #fff;
}
header .nav li:nth-child(3) a span {
    color: #34A0D5;
    border-bottom: 2px solid #34A0D5;
}
.serviceNav li:nth-child(6) 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{
    text-align: center;
    margin-bottom: 20px;
}
.main .title{
    font-size: 40px;
    color: #444;
    font-weight: bold;
    padding: 60px 0 70px;
}
.main img{
    width: 1080px;
}
.main .downLoad {
    margin: 86px 0 76px;
    cursor: pointer;
    display: inline-block;
}
.main .img4{
    width: 263px;
}
.main .img3{
    margin: 100px 0 150px;
}