.filter-mask {
  position: absolute;
  z-index: 3;
  top: 0;
  left: 0;
  right: 0;
  height: 100%;
  background-color: rgba(0,0,0,0.65);
  display: none;
}
.filter-mask.show {
  display: block;
}
.filter-mask .select-list {
  background-color: #fff;
  display: none;
}
.filter-mask .select-list.show {
  display: block;
}