#overlay {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-color: rgba(0, 0, 0, 1); /* 半透明的黑色背景 */
  display: flex;
  justify-content: center;
  align-items: center;
}

#gif-container {
  max-width: 50%;
  max-height: 50%;
}

#gif-container img {
  max-width: 50%;
  max-height: 50%;
}