hotline-bling.css

/* CSS declarations go here */
body {
    background: black;
}

#canvas {
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
    width: 100%;
    height: 100%;
}

#vid {
    position: absolute;
    top: 50%;
    left: 50%;
    margin: -240px 0 0 -423px;
}