#outer{
    width: 500px;
    height: 270px;
    margin: 100px auto;
    position: relative;
    overflow: hidden;
}
#inner{
    width: 2500px;
    height: 270px;
    position: absolute;
    font-size: 80px;
    overflow: hidden;
    text-align: center;
    line-height: 270px;
    color: white;
    left: 0;
}
#inner div{
    width: 500px;
    height: 270px;
    background: red;
    float: left;
}
#btn{
    top: 30px;
    position: absolute;
    list-style: none;
    right: 30px;
}
#btn li{
    width: 30px;
    height: 30px;
    float: left;
    position: relative;
    background: blue;
    border-radius:50%;
    font-size: 14px;
    text-align: center;
    line-height: 30px;
    cursor: pointer;
    margin: 2px;
    color:white;
    font-weight: 900;
}

#btn li.promoted{
    background: black;
}

#bannerLeft{
    width: 40px;
    height: 40px;
    background: gold;
    position: absolute;
    line-height: 40px;
    text-align: center;
    cursor: pointer;

}
#bannerRight{
    width: 40px;
    height: 40px;
    background: gold;
    position: absolute;
    line-height: 40px;
    text-align: center;
    cursor: pointer;
}