body, html {
  margin: 0;
  padding: 0;
  width: 100%;
  height: 100%;
  background: #000;
  overflow: hidden;
  cursor: none; /* 隱藏滑鼠 */
}

#game {
  position: relative;
  width: 100%;
  height: 100%;
}

.dog {
  position: absolute;
  font-size: 80px;
  user-select: none;
  transition: all 1s ease; /* 每次動作動畫時間 */
}

.bone {
  position: absolute;
  font-size: 40px;
  pointer-events: none;
  transition: all 1s linear;
}