body {
  background: #111;
  color: white;
  font-family: Arial, sans-serif;
  text-align: center;
}

.hidden {
  display: none;
}

canvas {
  background: #222;
  margin-top: 10px;
  border: 2px solid #555;
}

button {
  padding: 10px 20px;
  font-size: 16px;
  cursor: pointer;
}

.top-bar {
  display: flex;
  justify-content: space-between;
  width: 400px;
  margin: auto;
}