.product__price:has(.product__price-sale-box) {
  display: flex;
}
.product__price-sale-box {
  display: inline-block;
  align-self: center;
  margin-inline-start: 10px;
  max-width: none;
  vertical-align: middle;
  padding: 0;
  font-weight: bold;
  font-size: .8rem;
}

.product__price-sale-box.hidden {
  display: none;
}