JSFiddle - React, Tailwind, and code Playground

HTML

<div class="container">I'm aligned vertically!</div>

CSS

.container {
	line-height: 500px;
	background-color: #7396a1;
    padding: 0 30px;
    width: 200px;
    /* margin-left: auto; */
    /* margin-right: auto; */
    color: #fff;
}