Card headers / footers not inheriting styling from .card-outline-variant

[shamoon]

Seems to me that .card-outline-variant should pass this rather specific styling down to its usual descendants .card-header and .card-footer in the same way that .card-primary affects styling of these divs. Instead, at the moment you wound need to apply .card-outline-variant to the descendant divs themselves for them to have the same styling of the card.

Agreed?

Before:

After:

Simple fix is to add a few lines to the 'card-outline-variant' mixin, mixins/_cards.scss:

  .card-header,
  .card-footer {
     background-color: transparent;
     border-color: $color;
  }