JSFiddle - React, Tailwind, and code Playground

HTML

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css">
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>
<div class="container">
  <div class="col-lg-12">
    <div class="col-lg-4 col-md-4 col-sm-4 question-list">
      <ul class="list-group">
        <li class="2" data-toggle="collapse" data-target="#2" aria-expanded="false">Link</li>
        <div id="2" class="tab-content collapse mobile-answer">
          <p class="header">content of link</p>
          <div class="answer">
            <p>Bunch o' content here</p>
          </div>
        </div>

      </ul>
    </div>
  </div>
</div>

CSS

li {
  list-style-type: none;
}

.active {
  border-left: 3px solid #ce2523;
  padding-left: 7px;
  color: #000000;
}

JavaScript

$('.list-group li').on('click',function(){
	$(this).toggleClass('active')
})