JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrapper">
    
    <div class="inner">
    
    </div>
    </div>

CSS

.wrapper{
        width:400px;
        height:500px;
        background-color: rgba(255, 0, 0, 0.6);
        }
    
     .inner{
        width:200px;
        height:300px;
        background-color:blue;
        }