JSFiddle - React, Tailwind, and code Playground

HTML

<div class="outter">
    <div class="outter">
        <div class="inner" style="height: 50px; width: 50px;">
            a
        </div>
    </div>
</div>

CSS

div.inner
{
    border: 1px solid blue;
    margin: 1em;
}

div.outter
{
    border: 1px solid red;
    margin: 1em;
    display: inline-block;
}