Flex: Equal-height Cards

Cards keep the same height because the grid uses align-items: stretch and each card is a column flex container.

Card A
Short text.
Buttons
Card B
A bit more content1 that makes this card taller than Card A unless equalized by flexbox.
Buttons
Card C
Even more content1 to test stretching behaviour. The middle area expands while actions stay at the bottom.
Buttons