body {
  background: #000000;
  color: #bbbbbb;
  font: 100%/20px helvetica, arial, sans-serif;
}

canvas {
  display: block;
  height: 100%;
  left: 0;
  margin: 0;
  padding: 0;
  position: absolute;
  top: 0;
  width: 100%
}

#controlPanel {
  background: rgba(0,0,0,.75);
  border: 1px solid #333;
  border-radius: 5px;
  padding: 15px;
  position: absolute;
  top: 20px;
  left: 20px;
  z-index: 2;
}