body{
    background-color: #F3F3F3;
}
header .nav li:nth-child(1) a span {
    color: #34A0D5;
    border-bottom: 2px solid #34A0D5;
}
.serviceNav li:nth-child(7) 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 {
    margin-bottom: 80px;
}
.main img{
    width: 1080px;
    margin-top: 60px;
}
.main .img2{
    margin-top: 100px;
}