body {
  text-align: center;
  font-family: Arial;
  background: #222;
  color: white;
  margin: 0;
}

canvas {
  background: black;
  border: 4px solid white;
  width: 90vw;
  max-width: 400px;
  height: 90vw;
  max-height: 400px;
}

button {
  padding: 10px;
  margin: 5px;
  border: none;
  border-radius: 5px;
  font-size: 16px;
  cursor: pointer;
}

.controls {
  margin-top: 20px;
}

.controls button {
  font-size: 22px;
  width: 60px;
  height: 60px;
}