body {
    
}

.banner {
    width: 100%;
    height: 710px;
    background-color: aqua;
    position: relative;
    overflow: hidden;
    cursor: pointer
}

.imgbox {
    width: 100%;
    height: 710px;
    position: relative;
    background-color: #222;
    overflow: hidden
}

.img {
    position: absolute;
    display: none;
    left: 50%;
    margin-left: -960px
}

.im {
    display: block
}

.change {
    height: 100px;
    display: block;
    position: absolute;
    z-index: 20;
    opacity: .1;
    transition: .4s;
    top: 50%;
    margin-top: -50px
}

    .change:hover {
        opacity: 1
    }

.pre {
    left: 1%
}

.next {
    right: 1%
}

.cirbox {
    width: 88px;
    position: absolute;
    bottom: 15px;
    z-index: 10;
    left: 50%;
    margin-left: -44px;
    cursor: pointer
}

.cir {
    width: 12px;
    height: 12px;
    background-color: #fff;
    opacity: .4;
    float: left;
    border-radius: 6px;
    margin: 0 5px;
    cursor: pointer
}

    .cir:hover {
        background-color: cyan;
        transition: .8s
    }

.cr {
    opacity: 1
}

    .cr:hover {
        background-color: #fff
    }