message: fix(css): remove ContentGroup paddingTop
diff: @mixin content-group {
  .#{$prefix}--content-group {
  @include carbon--breakpoint(sm) {
  - padding-top: $carbon--layout-03;
  padding-bottom: $carbon--layout-05;
  &__title {
  margin-bottom: $carbon--layout-05;
  }
  }
  +
  @include carbon--breakpoint(lg) {
  - padding-top: $carbon--layout-05;
  - padding-bottom: $carbon--layout-07;
  + padding-bottom: $carbon--layout-06;
  &__title {
  margin-bottom: $carbon--layout-03;
  }
  &__children {
  margin-bottom: $carbon--layout-03;
  +
  + .#{$prefix}--image__img {
  + margin-bottom: $spacing-07;
  + }
  +
  + .#{$prefix}--content-item__heading {
  + margin-top: 0;
  + }
  }
  &__CTA {
  @include carbon--make-col(4, 8);
  }
  }
  -
  - margin-bottom: $carbon--layout-03;
  }
  }
  +
  @include exports('content-group') {
  @include content-group;
  }
  