JSFiddle - React, Tailwind, and code Playground

HTML

<div class="wrap">
    <div class="mycontent">
        Hello World!
    </div>
</div>

CSS

html, body {
    height: 100%;
    padding: 0;
    margin: 0;
}
.wrap {
    position: relative;
    top: 50%;
    left: 50%;
    transform: translate(-50%,-50%);
    display: inline-block;
    max-width: 100%;
    max-height: 100%;
}
.mycontent {
    width: 300px;
    height: 150px;
    background-color: rgb(50,150,250);
    color: #FFF;
    text-align: center;
    line-height: 150px;
    font-size: 25pt;
    font-family: sans-serif;
    font-weight: bold;
    border-radius: 5px;
}