Form Control Borders

HTML

<link rel="stylesheet" href="//stackpath.bootstrapcdn.com/bootstrap/4.1.0/css/bootstrap.min.css">
<script src="//code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<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">
<!-- 
  Bootstrap docs: https://getbootstrap.com/docs
-->

<div class="row">
  <div class="col-6">
    <input type="text" id="textbox" class="form-control border-foo" />
    Height: <span id="textbox-height"></span>
  </div>
  <div class="col-6">
    <select id="select" class="form-control border-foo">
      <option>test</option>
    </select>
    Height: <span id="select-height"></span>
  </div>
</div>

CSS

.border-foo {
  border-style: solid;
  border-width: 3px;
}

JavaScript

$("#textbox-height").text($("#textbox").height());
$("#select-height").text($("#select").height());