how to create margins btn cards in bootstrap 4 code example

Example 1: boostrap card

<div class="card" style="width: 18rem;">
  <div class="card-body">
    <h5 class="card-title">Card title</h5>
    <h6 class="card-subtitle mb-2 text-muted">Card subtitle</h6>
    <p class="card-text">Some quick example text to build on the card title and make up the bulk of the card's content.</p>
    <a href="#" class="card-link">Card link</a>
    <a href="#" class="card-link">Another link</a>
  </div>
</div>

Example 2: .card class

<style>
    .card {
      border: 1px solid #ccc;
      background-color: #f4f4f4;
      padding: 20px;
      margin-bottom: 10px;
    }
  </style>