#outer {
    width: 500px;
    height: 270px;
    margin: 100px auto;
    overflow: hidden;
    position: relative;
}

#inner {
    width: 2500px;
    height: 270px;
    position: absolute;
    top: 0;
    left: 0;
    color: #fff;
    font-size: 72px;
    text-align: center;
    line-height: 270px;
}

#inner div {
    width: 500px;
    height: 270px;
    background: red;
    float: left;
}

#btn {
    padding: 0;
    margin: 0;
    position: absolute;
    list-style: none;
    right: 30px;
    top: 30px;
}

#btn li {
    width: 30px;
    height: 30px;
    font-size: 14px;
    font-weight: bold;
    border-radius: 50%;
    cursor: pointer;
    background: orange;
    color: red;
    margin: 10px;
    text-align: center;
    line-height: 30px;
    float: left;
}

#btn li.promoted {
    color: #fff;
    background: black;
}


#bannerLeft {
    position: relative;
    height:  50px;
    width: 50px;;
    background: green;
    cursor:pointer;
    font-size:20px;
    color: white;
}

#bannerRight {
    position: relative;
    height:  50px;
    width: 50px;
    background: green;
    cursor:pointer;
    font-size:20px;
    color: white;

}