body {
  background-color: black;
  color: white;
}

#mainCanvas {
  display: block;
  width: 400px;
  height: 400px;
  margin: auto;
  margin-top: 100px;
  margin-bottom: 100px;
}

#controlPanel {
  width: 100%;
}

#controlPanel input {
  width: 100%;
}