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

body {
    margin: 0;
}

.container {
    position: relative;
}

canvas {
    width: 100%;
    height: 100%;
    display: block;
}

#fullscreen {
    position: absolute;
    right: 0;
    bottom: 0;
    width: 20px;
    height: 20px;
    margin: 20px;
    border: 4px solid rgba(100, 100, 100, .3);
    border-style: dashed;
    cursor: pointer;
}

.controls {
    position: absolute;
    top: 0;
    left: 0;
    margin: 20px;
}