html, body {
    height: 100%;
    margin: 0;
}

.container-fluid {
    height: 100%
}

.bgimg {
    background-image: url("https://source.unsplash.com/Olv8IytYdFM/800");
    background-position: center;
    background-repeat: no-repeat;
    background-size: cover;
    position: relative;
    height: 100%;
}