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

Detailed explanation

Ensuring that Bootstrap cards in a column layout maintain a uniform height can seem like a quest. Here are some tactics to save the day:

Make utility classes your best friend

Bootstrap has utility classes like .d-flex and .align-items-stretch waiting to be utilized. Apply these to your card containers to achieve a visually appealing layout.

<div class="d-flex flex-wrap align-items-stretch"> /* "Transform into Megazord!" */
  <div class="card">...</div>
  <div class="card">...</div>
  <!-- More Transformer cards -->
</div>


How to manage skyscrapers?

When cards need to occupy full vertical space, they need a .h-100 attribute. Now cards fill all available vertical space, while keeping the flex alignment on point.

<div class="card h-100">...</div> /* "To the moon, Alice!" */


Responsive grids – The Avengers of layouts

Flexbox is not always the only way. Bootstrap's grid system gives you the ability to control your layout in minute detail, especially when responsiveness is a concern. Introducing .row and .col, the dynamic duo for not only maintaining equal heights but also manipulating layouts on different screens.

<div class="container-fluid">
  <div class="row">
    <div class="col-md-4">
      <div class="card h-100">...</div>
    </div>
    <!-- More grid-based cards -->
  </div>
</div>


The mystery of the contents

The game of card layouts is a game of balance. No matter the classes you wield, the inner contents of the cards need to be balanced for a neat, uniform look. Use the mighty .card-block to ensure consistent formatting inside the cards.

Advanced tactics: The CSS cryptomancer

When precision is key, apply powerful spells like calc() alongside Bootstrap classes to get proportional height manipulations in a snap.

.card {
  height: calc(100% - 20px); /* "Now you see me, now you don't!" */
}


Remember, knights of code, never set a minimum height on your quests. This leads to inconsistency in your magnificent viewports. Instead, trust Bootstrap's responsive capabilities to carry you to victory.

Flexibility to change

Remember, your layouts need to be flexible on different screen sizes. Bootstrap's grid classes provide layout changes per breakpoint:

<div class="row">
  <div class="col-12 col-md-6 col-lg-4"> /* "We morph to serve!" */
    <div class="card h-100">...</div>
  </div>
  <!-- More adaptive columns/cards -->
</div>


Avoid the temptation of fixed heights

The key to brilliant layouts is to avoid fixed heights. Use margin-bottom for adding space between cards. This maintains a responsive design and helps the content to rule the card size, not the other way around.

Enhance your wisdom

Always refer to the old scrolls, aka Bootstrap documentation, for practical examples and deep understanding. Confused? Their examples are ikons of clarity, because documentation...assembles!