body {
  margin: 0;
  font-family: 'Segoe UI', sans-serif;
  background-color: #f9f9f9;
  text-align: center;
}

#toolbar {
  background-color: #ffffff;
  padding: 10px;
  box-shadow: 0 2px 4px rgba(0,0,0,0.1);
  position: sticky;
  top: 0;
  z-index: 10;
}

canvas {
  border: 1px solid #ccc;
  margin-top: 10px;
  background-color: white;
  cursor: crosshair;
}

button {
  margin: 5px;
  padding: 8px 12px;
  background-color: #007bff;
  color: white;
  border: none;
  border-radius: 5px;
  cursor: pointer;
}

button:hover {
  background-color: #0056b3;
}