html, body {
    position: absolute;
    top: 0; left: 0;
    width: 100%; height: 100%;
    margin: 0; border: 0; padding: 0;
    background-color: black;
}

canvas {
    position: absolute;
    top: 0; left: 0; right: 0; bottom: 0;
    margin: auto;
    border: 1px solid white;
    padding: 0;
}

img {
    margin: 0; border: 0; padding: 0;
}