body{
    background-color: #000;
}

#box{
    width: 512px;
    height: 192px;
    overflow: hidden;
    margin: 100px auto;
    border: 1px solid #fff;
    border-radius: 6px;
    position: relative;
    background-color: #fff;
}

#tab{
    list-style: none;
    padding: 0;
    margin: 0;
    position: absolute;
    
}

#tab li{
    width: 490px;
    height: 170px;
    margin: 10px;
    border: 1px solid #ccc;
    float: left;
    filter: alpha(opacity=30);opacity: .3;
}

#btn{
    position: absolute;
    right: 16px;
    bottom: 0;
    padding: 0;
    list-style: none;
    z-index: 1;
}

#btn li{
    display: block;
    width: 20px;
    height: 20px;
    float: left;
    margin-left: 5px;
    border-radius: 10px;
    background-color: #FCB54B;
    text-align: center;
    line-height: 20px;
    font-size: 12px;
    color: #fff;
}
#btn li.actived{
    background: #FF6600;
    font-weight: 700;
}