* {
    box-sizing: border-box;
    margin: 0;
    padding: 0;
}

#box {
    width: 100%;
    height: auto;
    overflow: hidden;
    position: relative;
}

#lunboimg{
    width: 100%;
    height: 100%;
    /* position:absolute; */
    display:flex
}
.a_img{
    width: 100%;
    height: 100%;
}
#lbimg{
    width: 100%;
    height: 100%;
    object-fit: cover;
}

#box:hover #selector{
    display: flex
}

#selector{
    width: 80px;
    height: 20px;
    position: absolute;
    bottom: 0;
    left: 49vw;
    display: none;
    justify-content: space-between;
    z-index: 100;
}

#selector>span{
    width: 15px;
    height: 15px;
    border-radius: 50%;
    background-color: rgb(255, 255, 255);
    opacity: 0.8;
    margin-right: 5px;
    cursor: pointer;
}

#selector>span:hover{
    background-color: #8a8a8a;
}

#left,#right{
    width: 40px;
    height: 40px;
    position:absolute;
    top: 300px;
    background-color: rgba(176, 196, 222, 0.422);
    font-size: 18px;
    border-radius: 50%;
    text-align: center;
    line-height: 100%;
    cursor: pointer;
    color: rgba(176, 196, 222, 0.724);
}

#left{
    left: 5;
}
#right{
    right:5
}

#left:hover,#right:hover{
    background-color: #8a8a8a;
    color: #ffffff;
}