html,
body {
  height: 100%;
  margin: 0;
  padding: 0;
  overflow: hidden;
}

#glass::before {
  content: "";
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  background-size: cover;
  z-index: 1;
  background-image: linear-gradient(to bottom, rgba(0, 0, 0, 0), rgba(0, 0, 0, 1), rgba(0, 0, 0, 1));

}

.loading {
  width: 100%;
  height: 100%;
  position: fixed;
  background-color: #fff;
  display: flex;
  align-items: center;
  justify-content: center;
  z-index: 5;
  top: 0;
}

@keyframes bounce {
  0%, 100% {
    transform: rotate(0deg);
  }
  50% {
    transform: rotate(-25deg); /* 逆时针旋转45度 */
  }
  100% {
    transform: rotate(0deg); /* 顺时针旋转45度回到初始位置 */
  }
}