.bg{
    background: url(../img/highBandwidth/banner.png) no-repeat center;
}
.sketch{
    margin-top: 48px;
    overflow: hidden;
}
.sketch .sketch-bg{
    position: relative;
    height: 399px;
    background: url(../img/highBandwidth/bg.png) no-repeat center;
    margin-top: 60px;
}
.sketch .sketch-bg .imgbox{
    margin-top: -93px;
    margin-left: -71px;
}
.sketch .sketch-bg .info{
    width: 500px;
    font-size: 16px;
    
    color: #575757;
    line-height: 28px;
    margin-left: 61px;
    margin-top: 99px;
}

.case{
    margin-top: 40px;
    overflow: hidden;
}
.case .case-box{
    margin: 40px 0;
}
.case .case-box .item>p{
    font-size: 16px;
    
    color: #575757;
    letter-spacing: 2px;
    margin-top: 20px;
}