.fullscreen-bg {
    position: fixed;
    top: -48px;
    left: 0px;
    right: 0px;
    bottom: -0px;
    width: 100%;
    height: ;
    overflow: hidden;
    z-index: -100;
}

.fullscreen-bg video {
    position: absolute;
    top: -48px;
    left: 0px;
    width: 100%;
    height: ;
    
}