Bootstrap cards with 100% height and margin bottom

Question

I am attempting to develop a grid of Bootstrap 4 cards with the following requirements:

• All cards must sit within one div class=\"row\", because I

Answer 1

After a little bit of experimentation, this one was easy to solve: I needed to add the mb-4 class to the containing column, not the card itself:

<div class="container">
  <div class="row">
    <div class="col-md-4 col-sm-6 mb-4">
      <div class="card h-100" style="background-color:#ff0000;">
        Test card content. 
      </div>
    </div>
    <div class="col-md-4 col-sm-6 mb-4">
      <div class="card h-100" style="background-color:#00ff00;">
        Test card content. Test card content. Test card content. Test card content. 
      </div>
    </div>
    <div class="col-md-4 col-sm-6 mb-4">
      <div class="card h-100" style="background-color:#0000ff;">
        Test card content. Test card content. Test card content. Test card content. Test card content. Test card content. Test card content. Test card content. 
      </div>
    </div>
    <div class="col-md-4 col-sm-6 mb-4">
      <div class="card h-100" style="background-color:#0f0f0f;">
        Test card content. 
      </div>
    </div>
  </div>
</div>

Hopefully this helps others out who are stuck in my same situation.