body {
  background: radial-gradient(circle at center, #0f0f0f, #050505);
  margin: 0;
  overflow: hidden;
  font-family: 'Segoe UI', sans-serif;
  color: white;
}

canvas {
  display: block;
  margin: 0 auto;
  background: transparent;
}

#controls {
  position: fixed;
  top: 10px;
  left: 10px;
  background: rgba(0,0,0,0.7);
  padding: 10px;
  border: 1px solid #0ff;
  border-radius: 10px;
}

#controls label {
  display: block;
  margin: 8px 0;
}

input, button {
  font-size: 1em;
}