.opacity_background{
    width: 100%;
    height: 100%;
    position: absolute;
    top: 0;
    left: 0;
    /* background: url("/ccb/server/CloudDocking/public/static-swiper.jpg"); */
    background:#000; 
    opacity: 0.8;
    margin: auto;
    z-index: 1111;
    display: none;
}