body {
    padding: 0;
    margin: 0;
    background: white;
}

body.has-white-canvas {
    background: black;
}

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

canvas {
    max-width: 100%;
    max-height: 100%;
    bottom: 0;
    left: 0;
    margin: auto;
    overflow: auto;
    position: fixed;
    width: auto;
    height: auto;
    right: 0;
    top: 0;
}