JSFiddle - React, Tailwind, and code Playground

HTML

<script src="https://code.jquery.com/jquery-3.4.1.slim.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.css">
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.js"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.js"></script>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/font-awesome/4.7.0/css/font-awesome.css">
<script src="https://cdn.jsdelivr.net/npm/leader-line@1.0.7/leader-line.min.js"></script>
<ul class="nav nav-tabs" id="myTab" role="tablist">
  <li class="nav-item" role="presentation">
    <a class="nav-link active" id="home-tab" data-toggle="tab" href="#home" role="tab" aria-controls="home" aria-selected="true">Home</a>
  </li>
  <li class="nav-item" role="presentation">
    <a class="nav-link" id="contact-tab" data-toggle="tab" href="#contact" role="tab" aria-controls="contact" aria-selected="false">Contact</a>
  </li>
</ul>
<div class="tab-content" id="myTabContent">
  <div class="tab-pane fade show active" id="home" role="tabpanel" aria-labelledby="home-tab">
    the home tab
  </div>
  <div class="tab-pane fade" id="contact" role="tabpanel" aria-labelledby="contact-tab">
    the contact tab
    <div id="callout" class="callout">
      <div class="callout-header">Header</div>
      <div class="callout-container">Location</div>
    </div>
    <div id="test">test</div>
  </div>
</div>

CSS

.row {
  background: #f8f9fa;
  margin-top: 20px;
}

.col {
  border: solid 1px #6c757d;
  padding: 10px;
}

#test {
	position: absolute;
	top: 275px;
	left: 600px;
  background-color: #00ff00;
  padding: 15px 5px;
}

.callout {
  position: absolute;
  top: 75px;
  left: 250px;
  margin-left: 20px;
  max-width: 300px;
}

.callout-header {
  padding: 10px 15px;
  background: #555;
  font-size: 24px;
  color: white;
}

.callout-container {
  padding: 15px 5px;
  opacity: .75;
  background-color: #00ff00;
  color: black;
}

JavaScript

const line = new LeaderLine(
  document.getElementById('callout'), 
  document.getElementById('test'),
  {
    path: 'arc', 
    color: 'red', 
    size: 2, 
    endPlug: 'arrow1',
    hide: true
  });
$('#contact-tab').on('shown.bs.tab', () => { line.position().show(); })
  .on('hide.bs.tab', () => { line.hide(); });