JSFiddle - React, Tailwind, and code Playground

HTML

<div class="top">
    <p>Testing</p>
</div>

CSS

div.top {
    width:100%;
    height:100%;
    text-align: center;
    color: white;
    background-color: #474747;
}
p {
    margin-top: 0px;
    font-size:10vw;
}
html, body {
    padding: 0;
    margin: 0;
    width: 100%;
    height: 100%;
}