.draggable {
  width: 35px;
  height: 35px;
  background-color: #007bff;
  border-radius: 50%;
  position: fixed;
  bottom: 70px;
  right: 20px;
  cursor: pointer;
  display: flex;
  justify-content: center;
  align-items: center;
  color: white;
  font-size: 20px;
  user-select: none;
}
.draggable2 {
  bottom: 100px;
}
.draggable img {
  pointer-events: none;
}
@keyframes spin {
  from {
    transform: rotate(0deg);
  }
  to {
    transform: rotate(360deg);
  }
}
.spin-animation {
  /* 继承 draggable-icon 的尺寸和定位 */
  display: flex;
  justify-content: center;
  align-items: center;
  /* 应用旋转动画 */
  animation-name: spin;
  animation-duration: 3s;
  animation-iteration-count: infinite;
  animation-timing-function: linear;
}