metamask-extension/ui/app/components/transaction-status/index.scss

.transaction-status {
  height: 26px;
  width: 81px;
  border-radius: 4px;
  background-color: #f0f0f0;
  color: #5e6064;
  font-size: .625rem;
  text-transform: uppercase;
  display: flex;
  justify-content: center;
  align-items: center;

  @media screen and (max-width: $break-small) {
    height: 16px;
    width: 70px;
    font-size: .5rem;
  }

  &--confirmed {
    background-color: #eafad7;
    color: #609a1c;
  }

  &--approved, &--submitted {
    background-color: #FFF2DB;
    color: #CA810A;
  }

  &--failed {
    background: lighten($monzo, 56%);
    color: $monzo;
  }
}