body { background:#111; color:#fff; font-family:sans-serif; text-align:center; }
    #canvasContainer { position:relative; width:800px; height:600px; margin:auto; border:2px solid #444; overflow:hidden; }
    canvas { position:absolute; top:0; left:0; }
    .controls { margin:15px; }
    input[type=range] { width:200px; }