/* ==================== 遮罩层样式 ==================== */

#fullbg {
  background-color: rgba(0, 0, 0, 0.7);
  position: fixed;
  z-index: 10;
  left: 0;
  top: 0;
  width: 100%;
  height: 100%;
  backdrop-filter: blur(2px);
  -webkit-backdrop-filter: blur(2px);
}