.bg-video {
    width: 100%;
    height: auto;
    position: fixed;
    left: 0;
    bottom: 0;
    z-index: 0;
}

body main .container[page='signin'] .sign-in-box,
body main .container-fluid[page='signin'] .sign-in-box
{
    z-index: 1;
    position: absolute;
    width: 100%;
    padding-left: 0;
    margin: 0;
    left: 0;
}