* {
    margin: 0;
    padding: 0;
}

html, body {
    height: 100%;
    width: 100%;
}

body {
    overflow: hidden;
}

#bg {
    position: fixed;
    top: 0;
    left: 0;
    width: 100%;
    height: 100%;
    overflow: hidden;
}

#bg img {
    width: 100%;
    height: 100%;
    object-fit: cover;   /* Makes image responsive */
    object-position: center; /* Keeps focus centered */
}