body {
  background: #111;
  color: #eee;
  text-align: center;
  font-family: monospace;
  margin: 0;
  padding: 20px;
}

h1 {
  margin-bottom: 10px;
}

canvas {
  border: 2px solid white;
  background: black;
  display: block;
  margin: 20px auto;
}

#instructions {
  margin-top: 10px;
  font-size: 14px;
}