metamask-extension/ui/pages/send/gas-display/index.scss

.gas-display {
  overflow-y: auto;
  flex: 1;

  .transaction-detail-rows {
    padding: 10px;
    border-radius: 8px;
    border: 1px solid var(--color-border-default);
    margin: 16px 16px;

    .transaction-detail-item {
      &:not(:first-child) {
        border-top: 1px solid var(--color-border-default);
      }
    }
  }

  &__title {
    &__estimate {
      font-size: 12px;
      line-height: inherit;
    }
  }

  &__gas-fee-warning {
    color: var(--color-warning-default);
  }

  &__gas-fee-label {
    position: relative;
    white-space: nowrap;
  }

  &__warning-message {
    height: 120px;
  }

  &__total-amount,
  &__total-value {
    position: relative;
  }

  &__confirm-approve-content {
    &__warning {
      @media screen and (max-width: $break-small) {
        padding: 0 32px 16px 16px;
        position: fixed;
        bottom: 80px;
        // We set z-index above ".send-v2__hex-data__input" by 1 index. ".send-v2__hex-data__input"
        // was set to `z-index: 1025;` 4 years ago from the time of this comment. This should be a temp fix.
        // TODO: Refactor z-indexes
        z-index: 1026;
      }
    }
  }

  &__link {
    text-transform: lowercase;
  }
}