JSFiddle - React, Tailwind, and code Playground

HTML

<div class="text-overflow">
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</div>
<a class="btn-overflow"...

CSS

.text-overflow {
      height:120px;
      display:block; 
      overflow:hidden;
      word-break: break-word;
      word-wrap: break-word;
  }

  .btn-overflow {
    display: none;
    text-decoration: none; 
  }

JavaScript

var text = $('.text-overflow'),
     btn = $('.btn-overflow'),
       h = text[0].scrollHeight; 

if(h > 120) {
    btn.addClass('less');
    btn.css('display', 'block');
}

btn.click(function(e) 
{
  e.stopPropagation();

  if (btn.hasClass('less')) {
      btn.removeClass('less');
      btn.addClass('more');
      btn.text('Show less');

      text.animate({'height': h});
  } else {
      btn.addClass('less');
      btn.removeClass('more');
      btn.text('Show more');
      text.animate({'height': '120px'});
  }  
});