JSFiddle - React, Tailwind, and code Playground

HTML

<body>
    <div class="external">
        <div class="internal">Example</div>
    </div>
    
  
    <script src="//cdnjs.cloudflare.com/ajax/libs/FitText.js/1.1/jquery.fittext.min.js"></script>

</body>

CSS

.internal{width:100%;height:100%}
.external{width:400px;height:50px;background-color:yellow}

JavaScript

$(".external").fitText(0.5);