Bootstrap class: .card-deck

<div class="card-deck">
  <div class="card">
    <div class="card-body">
      <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 content is a little bit longer.</p>
    </div>
  </div>
  <div class="card">
    <div class="card-body">
      <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>
    </div>
  </div>
  <div class="card">
    <div class="card-body">
      <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>
    </div>
  </div>
</div>

Preview

Card title

This is a wider card with supporting text below as a natural lead-in to additional content. This content is a little bit longer.

Card title

This card has supporting text below as a natural lead-in to additional content.

Card title

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.

Sass source

/* _card.scss:141 */
.card-deck {
  display: flex;
  flex-direction: column;

  .card {
    margin-bottom: $card-deck-margin;
  }

  @include media-breakpoint-up(sm) {
    flex-flow: row wrap;
    margin-right: -$card-deck-margin;
    margin-left: -$card-deck-margin;

    .card {
      display: flex;
      // Flexbugs #4: https://github.com/philipwalton/flexbugs#flexbug-4
      flex: 1 0 0%;
      flex-direction: column;
      margin-right: $card-deck-margin;
      margin-bottom: 0; // Override the default
      margin-left: $card-deck-margin;
    }
  }
}

Uses variables

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/* _card.scss:141 */
$card-deck-margin
$card-deck-margin
$card-deck-margin
$card-deck-margin
$card-deck-margin

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