body {
  font-family: Arial, sans-serif;
  text-align: center;
  background: #f5f5f5;
  padding: 20px;
}

canvas {
  max-width: 100%;
  border-radius: 10px;
  background: #fff;
  box-shadow: 0 0 10px rgba(0,0,0,.1);
}

.controls {
  margin-top: 15px;
}

button {
  margin: 5px;
  padding: 8px 12px;
  cursor: pointer;
}