metamask-extension/ui/app/components/transaction-view-balance/index.scss

.transaction-view-balance {
  display: flex;
  justify-content: space-between;
  align-items: center;
  flex: 1;
  height: 54px;
  min-width: 0;

  @media screen and (max-width: $break-small) {
    flex-direction: column;
    height: initial;
    width: 100%;
  }

  &__balance {
    margin: 0 12px;
    display: flex;
    flex-direction: column;
    min-width: 0;

    @media screen and (max-width: $break-small) {
      align-items: center;
      margin: 16px 0;
      padding: 0 16px;
      max-width: 100%;
    }
  }

  &__primary-balance {
    font-size: 1.5rem;

    @media screen and (max-width: $break-small) {
      font-size: 1.75rem;
      width: 100%;
    }
  }

  &__secondary-balance {
    font-size: 1.15rem;
    color: #a0a0a0;
  }

  &__balance-container {
    flex: 1;
    display: flex;
    flex-direction: row;
    align-items: center;
    min-width: 0;

    @media screen and (max-width: $break-small) {
      flex-direction: column;
      width: 100%;
    }
  }

  &__buttons {
    display: flex;
    flex-direction: row;

    @media screen and (max-width: $break-small) {
      margin-bottom: 16px;
    }
  }

  &__button {
    min-width: initial;
    width: 100px;

    &:not(:last-child) {
      margin-right: 12px;
    }
  }
}