The .card-deck class creates an equal height and width grid of cards. The layout will automatically adjust as you insert more cards.
In this example we have added extra content to the first card, to make it taller. Notice how the other cards follow.
Note: The cards are displayed vertically on small screens (less than 576px):
Some text inside the first card
Some more text to increase the height
Some more text to increase the height
Some more text to increase the height
Some text inside the second card
Some text inside the third card
Some text inside the fourth card