submit-social-housing-lettings-and-sales-data/app/frontend/styles/_header.scss

.app-header {
  border-bottom: govuk-spacing(2) solid $govuk-brand-colour;

  .govuk-header__logo {
    @include govuk-media-query($from: desktop) {
      width: 60%;
    }

    @include govuk-media-query($from: 860px) {
      width: 75%;
    }
  }

  .govuk-header__content {
    @include govuk-media-query($from: desktop) {
      width: 40%;
    }

    @include govuk-media-query($from: 860px) {
      width: 25%;
    }
  }
}

.app-header--orange,
.app-header--orange .govuk-header__container {
  border-bottom-color: govuk-colour("orange");
}

.app-header__no-border-bottom {
  border-bottom: 0;
}