.price_detail {
  display: inline-block;
  line-height: 1.4;
  white-space: nowrap;
  position: relative;
}

/* "(税込"以降を下にずらす */
.price_detail::after {
  content: attr(data-taxtext); /* 税込部分を別表示 */
  display: block;
  font-size: 14px;
  color: #555;
  margin-top: 4px;
}