message: chore(promo-banner): drift away from BEM concatenation
  ### Description
  This change to promo banner style drifts away from BEM concatenation, so the style can be reused with Web Components.
  ### Changelog
  **Changed**
  A change to promo banner style drifts away from BEM concatenation, so the style can be reused with Web Components.
diff: .#{$prefix}--promo-banner {
  padding-top: $layout-03;
  padding-bottom: $layout-05;
  +
  @include carbon--make-container;
  - &__row {
  + }
  +
  + .#{$prefix}--promo-banner__row {
  @include carbon--make-row;
  }
  - &__left-column {
  +
  + .#{$prefix}--promo-banner__left-column {
  margin-bottom: $layout-02;
  @include carbon--make-col-ready;
  @include carbon--make-col(4, 4);
  +
  @include carbon--breakpoint('lg') {
  @include carbon--make-col(3, 16);
  }
  }
  - &__content {
  + .#{$prefix}--promo-banner__content {
  @include carbon--make-col(4, 4);
  @include carbon--make-col-ready;
  +
  @include carbon--breakpoint('md') {
  @include carbon--make-col(8, 8);
  }
  +
  @include carbon--breakpoint('lg') {
  @include carbon--make-col-offset(1, 16);
  @include carbon--make-col(8, 16);
  }
  }
  - &__copy {
  +
  + .#{$prefix}--promo-banner__copy {
  margin-bottom: $layout-02;
  }
  }
  -}
  @include exports('promo-banner') {
  @include promo-banner;
  