So in Bootstrap v4, I see there\'s a new feature for card decks ( http://v4-alpha.getbootstrap.com/components/card/#decks ) that makes a group of cards, with their height equal
Here you go, http://codepen.io/KarlDoyle/pen/pypWbR
The main thing is that you have to override the styles. as shown below.
.card-deck {
display: flex;
justify-content: flex-start;
flex-flow: row wrap;
align-items: stretch;
}
.card-deck .card {
display: block;
flex-basis: 33.3%; /* change this value for each breakpoint*/
}