JSFiddle - React, Tailwind, and code Playground

HTML

<div id="example"></div>

CSS

#example
{
    position: fixed;
    /* center the div */
    right: 0;
    left: 0;
    margin-right: auto;
    margin-left: auto;
    /* give it dimensions */
    min-height: 10em;
    width: 90%;
    /* just for example presentation */
    top: 5em;
    background-color: blue;
}