.mbfBtn{
    background: transparent url("../image/dot.png") center center no-repeat;
    background-size: 24px 24px;
    margin:auto;
}
.mbfBtn.ai{
    background-image: url("../image/icon/zhinengdengguang.png");
}
.mbfBtn.meetingroom{
    background-image: url("../image/icon/huiyishi.png");
}
.mbfBtn.air{
    background-image: url("../image/icon/gongweihuanjing.png");
}
.mbfBtn.locker{
    background-image: url("../image/icon/menjin.png");
}
.mbfBtn.retail{
    background-image: url("../image/icon/huojia.png");
}
.mbfBtn.power{
    background-image: url("../image/icon/nenghao.png");
}