body {
  margin: 0;
  background: #1a1a1a;
  display: flex;
  justify-content: center;
  align-items: center;
  height: 100vh;
  flex-direction: column;
  font-family: monospace;
}
canvas {
  border: 2px solid #444;
  cursor: crosshair;
}
.info {
  color: #888;
  margin-top: 10px;
  font-size: 14px;
}
.controls {
  color: #aaa;
  margin-bottom: 10px;
  font-size: 12px;
}