body {
  margin: 0;
  overflow: hidden;
  font-family: Arial, sans-serif;
}

#toolbar {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  background: #333;
  padding: 5px;
  display: flex;
  align-items: center;
  gap: 5px;
  z-index: 10;
}

#toolbar button, #toolbar input[type="color"] {
  padding: 5px 10px;
  border: none;
  cursor: pointer;
  border-radius: 3px;
  font-size: 14px;
}

#toolbar button.selected {
  background: #4CAF50;
  color: white;
}

#toolbar button:hover {
  background: #555;
  color: white;
}

canvas {
  position: absolute;
  top: 0;
  left: 0;
  cursor: crosshair;
  background: #fff;
}