metamask-extension/ui/app/components/transaction-breakdown/transaction-breakdown-row/index.scss

.transaction-breakdown-row {
  font-size: .75rem;
  color: $scorpion;
  display: flex;
  justify-content: space-between;
  padding: 8px 0;

  &:not(:last-child) {
    border-bottom: 1px solid #d8d8d8;
  }

  &__title {
    padding-right: 8px;
  }

  &__value {
    min-width: 0;
  }
}