How to make Bootstrap 4 cards the same height in card-columns?

I am using Bootstrap 4 alpha 2 and taking advantage on cards. Specifically, I am working with this example taken from the official docs. As title says, how can I make all cards the same height?

EDIT: All I can think by now is setting the following CSS rule:

.card {
    min-height: 200px;
}

But that is just an hard coded solution that won't work in general case. The code in my view is the same as the one in the docs i.e:

<div class="card-columns">
  <div class="card">
    <img class="card-img-top" data-src="..." alt="Card image cap">
    <div class="card-block">
      <h4 class="card-title">Card title that wraps to a new line</h4>
      <p class="card-text">This is a longer card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.</p>
    </div>
  </div>
  <div class="card card-block">
    <blockquote class="card-blockquote">
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
      <footer>
        <small class="text-muted">
          Someone famous in <cite title="Source Title">Source Title</cite>
        </small>
      </footer>
    </blockquote>
  </div>
  <div class="card">
    <img class="card-img-top" data-src="..." alt="Card image cap">
    <div class="card-block">
      <h4 class="card-title">Card title</h4>
      <p class="card-text">This card has supporting text below as a natural lead-in to additional content.</p>
      <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
    </div>
  </div>
  <div class="card card-block card-inverse card-primary text-xs-center">
    <blockquote class="card-blockquote">
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat.</p>
      <footer>
        <small>
          Someone famous in <cite title="Source Title">Source Title</cite>
        </small>
      </footer>
    </blockquote>
  </div>
  <div class="card card-block text-xs-center">
    <h4 class="card-title">Card title</h4>
    <p class="card-text">This card has supporting text below as a natural lead-in to additional content.</p>
    <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
  </div>
  <div class="card">
    <img class="card-img" data-src="..." alt="Card image">
  </div>
  <div class="card card-block text-xs-right">
    <blockquote class="card-blockquote">
      <p>Lorem ipsum dolor sit amet, consectetur adipiscing elit. Integer posuere erat a ante.</p>
      <footer>
        <small class="text-muted">
          Someone famous in <cite title="Source Title">Source Title</cite>
        </small>
      </footer>
    </blockquote>
  </div>
  <div class="card card-block">
    <h4 class="card-title">Card title</h4>
    <p class="card-text">This is a wider card with supporting text below as a natural lead-in to additional content. This card has even longer content than the first to show that equal height action.</p>
    <p class="card-text"><small class="text-muted">Last updated 3 mins ago</small></p>
  </div>
</div>

You can either put the classes on the "row" or the "column"? Won't be visible on the cards (border) if you use it on the row. https://v4-alpha.getbootstrap.com/utilities/flexbox/#align-items

<div class="container">
    <div class="row">
          <div class="col-lg-4 d-flex align-items-stretch">

Some of the other answers here seem 'wacky'. Why would use a min-height or even worse a fixed height?

I thought this issue (equal heights) was part of the reason for progression away from floating block divs?

I'm using Bootstrap 4 (Beta 2). Meanwhile the situations seems to have changed. I had the same problem and found an easy solution. This is my code:

<div class="container-fluid content-row">
    <div class="row">
        <div class="col-sm-12 col-lg-6">
            <div class="card h-100">
                … content card …
            </div>
        </div>
        … all the other cards … 
    </div>
</div>

With "col-sm-12 col-lg-6" I've made the cards responsive. With "card h-100" I've set all cards to the height of their parent column. On my system this works, but I'm not a pro. So, hopefully I helped someone.

djibe

Best solution, Bootstrap 4 has all you need : USE THE .d-flex and .flex-fill class. Don't use the card-decks as they are not responsive. I used col-sm, you can use the .col class you want.

Here is the beast, try to reduce the browser window to XS to see it in action :

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" rel="stylesheet" />

<link href="https://fonts.googleapis.com/css?family=Roboto:300,300i,400,400i,500,500i,700,700i" rel="stylesheet">
<div class="container">
  <div class="row my-4">
    <div class="col">
      <div class="jumbotron">
        <h1>Bootstrap 4 Cards all same height demo</h1>
        <p class="lead">by djibe.</p>
        <span class="text-muted">(thx to BS4)</span>
        <p>Dependencies : standard BS4</p>
        <p>
          Enjoy the magic of flexboxes and leave the useless card-decks.
        </p>
        <div class="container-fluid">
          <div class="row">
            <div class="col-sm d-flex">
              <div class="card card-body flex-fill">
                A small card content.
              </div>
            </div>
            <div class="col-sm d-flex">
              <div class="card card-body flex-fill">
                "Lorem ipsum dolor sit amet, consectetur adipiscing elit, sed do eiusmod tempor incididunt ut labore et dolore magna aliqua. Ut enim ad minim veniam, quis nostrud exercitation ullamco laboris nisi ut aliquip ex ea commodo consequat. Duis aute irure dolor
                in reprehenderit in voluptate velit esse cillum dolore eu fugiat nulla pariatur. Excepteur sint occaecat cupidatat non proident, sunt in culpa qui officia deserunt mollit anim id est laborum."
              </div>
            </div>
            <div class="col-sm d-flex">
              <div class="card card-body flex-fill">
                Another small card content.
              </div>
            </div>
          </div>
        </div>
      </div>
    </div>
  </div>

UPDATE: In Bootstrap 4, flexbox is now default, and each card-deck row will contain 3 cards. The cards will fill to full height.

http://www.codeply.com/go/x91w5Cl6ip

The Bootstrap 4 alpha card-columns uses CSS3 columns which don't really support equal heights (except column-fill which is only suppored in Firefox).

If you instead enable Bootstrap 4 flexbox mode, you could instead use the card-deck and a little CSS to equalize the height and wrap every 3 columns.

@media (min-width:34em) {
    .card-deck > .card
    {
        width: 29%;
        flex-wrap: wrap;
        flex: initial; 
    }
}

http://codeply.com/go/YFFFWHVoRB

You can apply the class h-100, which stands for height 100%.

Here is how I did it:

CSS:

.my-flex-card > div > div.card {
    height: calc(100% - 15px);
    margin-bottom: 15px;
}

HTML:

<div class="row my-flex-card">
    <div class="col-lg-3 col-sm-6">
        <div class="card">
            <div class="card-block">
                aaaa
            </div>
        </div>
    </div>
    <div class="col-lg-3 col-sm-6">
        <div class="card">
            <div class="card-block">
                bbbb
            </div>
        </div>
    </div>
    <div class="col-lg-3 col-sm-6">
        <div class="card">
            <div class="card-block">
                cccc
            </div>
        </div>
    </div>
    <div class="col-lg-3 col-sm-6">
        <div class="card">
            <div class="card-block">
                dddd
            </div>
        </div>
    </div>
</div>

wrap the cards inside

<div class="card-group"></div>

<div class="card-deck"></div>

I took a slightly different approach. Using the Card Deck wrapper

I added a style rule that limits the height of the card block:

.card .card-block {max-height:300px;overflow:auto;}

This give the following result:

Most minimal way to achieve this (that I know of):

Apply .text-monospace to all texts in in the card.
Limit all texts in the cards to same number of characters.

UPDATE

Add .text-truncate in the card's title and or other texts. This forces texts to a single line. Making the cards have same height.

If anyone is interested, there is a jquery plugin called: jquery.matchHeight.js

https://github.com/liabru/jquery-match-height

matchHeight makes the height of all selected elements exactly equal. It handles many edge cases that cause similar plugins to fail.

For a row of cards, I use:

<div class="row match-height">

Then enable site-wide:

$('.row.match-height').each(function() {
   $(this).find('.card').not('.card .card').matchHeight(); // Not .card .card prevents collapsible cards from taking height
});

jsfiddle

Just add the height you want with CSS, example: