How to add vertical spacing between Bootstrap Cards

Question

I am working with boostrap cards, and the following is what I have them currently looking like:

Now what I'd like to do is add vertical space between the cards so that Card 1 and Card 3 aren't stuck together as well as Card 2 and Card 4.

The following is my code and setup for the cards I currently have:

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet"/>
<div class="container">
  <div class="row">
    <div class="col-sm-6">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">CARD 1</h5>
          <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-sm-6">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">CARD 2</h5>
          <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-sm-6">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">CARD 3</h5>
          <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-sm-6">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">CARD 4</h5>
          <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
  </div>
</div>

Answer 1

Add Class mb-3 for <div class="col-sm-6 mb-3">

<link href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" rel="stylesheet"/>
<div class="container">
  <div class="row">
    <div class="col-sm-6 mb-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">CARD 1</h5>
          <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-sm-6 mb-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">CARD 2</h5>
          <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>

    <div class="col-sm-6 mb-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">CARD 3</h5>
          <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>
    <div class="col-sm-6 mb-3">
      <div class="card">
        <div class="card-body">
          <h5 class="card-title">CARD 4</h5>
          <p class="card-text">With supporting text below as a natural lead-in to additional content.</p>
          <a href="#" class="btn btn-primary">Go somewhere</a>
        </div>
      </div>
    </div>

  </div>
</div>

if you want more space, bootstrap class available like mb-4 mb-5

more info here