.un_price_dl dt {
  width: 112px;
}

.un_price_dl dd {
  width: calc(100% - 131px);
}

@media screen and (min-width: 960px) {
  .un_price_dl dt {
    width: 115px;
  }

  .un_price_dl dd {
    width: calc(100% - 134px);
  }
}