JSFiddle - React, Tailwind, and code Playground

HTML

<div class="out">
    <div class="inn">Inner</div>
</div>

CSS

.out {
    background: blue;
    width: auto;
    padding: 20px;
    margin: 20px;
}

.inn {
    background: red;
    width: auto; /* Chyba! Nastav width: auto; */
    padding: 20px;
    margin: 20px;
}