* {
    margin:0;
    padding:0;
}

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

canvas {
    padding: 0;
    margin: auto;
    display: block;
    position: absolute;
    top: 0;
    bottom: 0;
    left: 0;
    right: 0;
}

#controls {
    position: fixed;
    z-index: 100;
    top: 1em;
    left: 1em;
}