- Instead of negative left/right margins, we selectively apply margins to the cards as needed. This way the first and last child never receive a left and right margin (respectively), so we don't need to negative indent those at the .card-deck level.
- Drops the margin-bottom override on the .card because there's no more default margin there.
- Drop the margin-bottom from the .card-deck to match our lack of margins on the card.
This and the previous commit fixes#19883.
040acd30db