JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<div class="container">
  <div class="row flex-row">
    <div class="col-md-5">
      <h4>My List</h4>
      <div style="border: 1px solid black; height:400px; overflow-y:auto">
        <ul>
          // List of checkboxes
        </ul>
      </div>
    </div>

    <div class="col-md-2">
      <input type="button" id="btnAddField" class="btn btn-primary" value="Add" />
      <input type="button" id="btnRemoveField" class="btn btn-primary" value="Remove" />
    </div>

    <div class="col-md-5">
      <h4>Selected Fields</h4> // This will contain the list selected from the checkboxes.
    </div>
  </div>
</div>

CSS

@media(min-width: 992px) {
  .flex-row {
    display: flex;
    align-items: center;
  }
}