JSFiddle - React, Tailwind, and code Playground

HTML

<div id="block">
    <div id="right">Right</div>
    <div id="middle">Middle</div>
</div>

CSS

#middle {
    background-color: #494949;
    width: 200px;
    height: 120px;
    
    display: block;
}

#right {
    background-color: #949494;
    width: 250px;
    height: 120px;
    float: right;
}