metamask-extension/ui/pages/confirmation/components/confirmation-footer/confirmation-footer.scss

.confirmation-footer {
  grid-area: footer;

  &__actions {
    display: flex;
    border-top: 1px solid var(--color-border-muted);
    background-color: var(--color-background-default);
    padding: 16px;

    & .button {
      &:first-child {
        margin-right: 16px;
      }

      &.centered {
        margin-right: 0;
      }
    }
  }
}