html,body{
    width: 100%;
    height: 100%;
}
#index_video {
    height: 100%;
    width: 100%;
    object-fit: cover;
    z-index: -100;
    right: 0;
    bottom: 0;
    background-size: cover;
    overflow: hidden;
}

.box_video {
    height: 80vh;
    width: 100%;
    background-size: cover;
    overflow: hidden;
}