*{
    padding: 0;
    margin: 0;
}

body{
    width: 100vw;
    height: auto;
    display: flex;
    justify-content: center;
    overflow-x: hidden;
    min-width: 1080px;
}

/* 主框 */
.mainBox{
    width: 1920px;
    height: 3387px;
    background-image: url("xlweb_imgs/1000.jpg");
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
}

/* 备案号 */
.bei_an_hao {
    width: 100%;
    height: auto;
    display: flex;
    justify-content: center;
    margin-top: 100px;
    position: absolute;
    bottom: 1%;
}