.fall-container {
  position: fixed;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  pointer-events: none;
  z-index: 1000;
}

.leaf {
  position: absolute;
  width: 40px;
  height: 40px;
  background-image: url('../images/float.png'); /* 可換成自己的楓葉圖片 */
  background-size: contain;
  background-repeat: no-repeat;
  animation: fall linear infinite;
}

@keyframes fall {
  0% {
    transform: translateY(-100px) rotate(0deg);
    opacity: 0.6;
  }
  100% {
    transform: translateY(110vh) rotate(360deg);
    opacity: 0.3;
  }
}