message: fix: NavBar text vertical align middle
diff: .van-icon {
  color: $blue;
  + vertical-align: middle;
  }
  &__arrow {
  margin: 0 -15px;
  padding: 0 15px;
  display: inline-block;
  + vertical-align: middle;
  &:active {
  background-color: $active-color;
  