* {        padding: 0px;        margin: 0px;    }        .banner {        width: 100%;        height: 600px;        font-size: 0;        overflow: hidden;        position: relative;    }        .banner_img {        width: 100%;        height: 600px;        position: absolute;        left: 0;        top: 0;    }        .banner_img li {        width: 100%;        height: 600px;        display: inline-block;        background-position: center;        background-repeat: no-repeat;        float: left;        list-style: none;    }        .banner_list {        height: 50px;        top: 550px;        position: relative;        margin: 0 auto;        z-index: 1;    }        .banner_list span {        display: block;        cursor: pointer;        width: 14px;        height: 14px;        border-radius: 50%;        border: 3px solid #555;        float: left;        margin: 0 5px;    }        .banner_list .spcss {        border: 3px solid yellowgreen;    }        .banner_left {        position: absolute;        height: 90px;        width: 60px;        top: 50%;        left: -60px;        background-color: rgba(73,72,62, 0.6);        margin-top: -45px;        text-align: center;        transition: all .5s;        z-index: 2;    }        .banner_left:hover {        background-color: rgba(73,72,62, 0.9);    }        .banner_right {        position: absolute;        height: 90px;        width: 60px;        top: 50%;        right: -60px;        background-color: rgba(73,72,62, 0.6);        margin-top: -45px;        text-align: center;        transition: all .5s;        z-index: 2;    }        .banner_right:hover {        background-color: rgba(73,72,62, 0.9);    }        .banner_left img {        margin-top: 22px;    }        .banner_right img {        margin-top: 22px;    }