body {
  margin: 0;
  font-family: Arial, sans-serif;
  overflow: hidden;
  background: #f0f0f0;
}

#toolbar {
  position: fixed;
  top: 0;
  left: 0;
  right: 0;
  height: 50px;
  background: #222;
  display: flex;
  align-items: center;
  padding: 0 10px;
  gap: 10px;
  color: white;
}

#toolbar button {
  padding: 6px 12px;
  border: none;
  border-radius: 6px;
  cursor: pointer;
}

#toolbar button:hover {
  background: #444;
  color: #fff;
}

#sizeSlider {
  vertical-align: middle;
}

#board {
  position: absolute;
  top: 50px;
  left: 0;
  right: 200px;
  bottom: 0;
  background: white;
  cursor: crosshair;
}

#userPanel {
  position: fixed;
  top: 50px;
  right: 0;
  bottom: 0;
  width: 200px;
  background: #333;
  color: white;
  padding: 10px;
  overflow-y: auto;
}