JSFiddle - React, Tailwind, and code Playground

HTML

<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="//cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.0/umd/popper.min.js"></script>
<script src="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/js/bootstrap.min.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.min.css">
<div class="container">
  <div class="row">
    <div class="col-6">
      <h3>Before</h3>

      <div class="embed-responsive embed-responsive-1by1">
        <img src="https://placehold.it/1280x600" alt="" class="embed-responsive-item">
      </div>
      <div class="embed-responsive embed-responsive-1by1 mt-3">
        <img src="https://placeimg.com/1280/600/nature" alt="" class="embed-responsive-item">
      </div>
    </div>
    <div class="col-6">
      <h3>After</h3>
      <div class="embed-responsive embed-responsive-1by1">
        <img src="https://placehold.it/1280x600" alt="" class="embed-responsive-item fix">
      </div>
      <div class="embed-responsive embed-responsive-1by1 mt-3">
        <img src="https://placeimg.com/1280/600/nature" alt="" class="embed-responsive-item fix">
      </div>
    </div>
  </div>
</div>

CSS

.wrap {
  max-width: 200px;
  margin: 1rem auto;
}

.fix {
  object-fit: cover;
}