body {
  margin: 0;
  overflow: hidden;
}

.toolbar {
  position: fixed;
  bottom: 20px;
  left: 50%;
  transform: translateX(-50%);
  background: rgba(255, 255, 255, 0.9);
  padding: 12px 20px;
  border-radius: 25px;
  box-shadow: 0 4px 10px rgba(0,0,0,0.15);
  display: flex;
  gap: 15px;
  align-items: center;
  justify-content: center;
}

#sizeDisplay {
  min-width: 45px;
  text-align: center;
}

#whiteboard {
  touch-action: none;
}

button {
  padding: 5px 10px;
  cursor: pointer;
}

input[type="range"] {
  vertical-align: middle;
}