yimei_spa/components/dist/backdrop/index.wxss

.wux-backdrop {
  background: rgba(0,0,0,.4)
}
.wux-backdrop,
.wux-backdrop--transparent {
  position: fixed;
  z-index: 1000;
  top: 0;
  right: 0;
  left: 0;
  bottom: 0
}
.wux-backdrop--transparent {
  background: 0 0
}