JSFiddle - React, Tailwind, and code Playground

HTML

<div class="col-md-8">
<span class="btn">клик</span>
<div class="modal">"окно"</div>
        <ul>
               <li><a class="md-trigger" href="#modal-1" data-modal="modal-1" >Link</a></li>
                <li><a class="link" href="">link</a></li>
                 <li><a class="link" href="">link</a></li>
                  <li><a class="link" href="">link</a></li>
           </ul>                           
 </div>

CSS

.btn {
  background: #f00;
  padding: 5px;
  color: #fff;
}
.modal {
  display: none;
  background: #eee;
  margin: 20px 0;
}

JavaScript

$('.btn').click(function	() {
	$('.modal').slideToggle();
})