#banner{
    width: 100%;
    aspect-ratio: 1905/500;
    margin: 0px auto 30px;
    position: relative;
}

#banner .pic{
    width: 100%;
    height:100%;
}

#banner .pic>img{
    position: absolute;
    top: 0px;
    left: 0px;
    display: none;
}

#banner>.btn{
    width:100px;
    height: 20px;
    position: absolute;
    bottom: 10px;
    left: 50%;
    margin-left: -50px;
}

#banner .btn ul{
    list-style: none;
}

#banner .btn ul li{
    width: 6px;
    height: 6px;
    border: 2px solid #757575;
    border-color: rgba(255,255,255,0.3);
    border-radius: 50%;
    display: inline-block;
    text-align: center;
    margin: 0 3px;
    background: rgba(0,0,0,0.4);
    cursor: pointer;
}

#banner .btn ul li.active{
     background: rgba(255,255,255,0.4);
     border-color: rgba(0,0,0,0.4);
}