JSFiddle - React, Tailwind, and code Playground

HTML

<div class="mainCont">
<div class="childCont">Some text</div>
</div>

CSS

.childCont {
    left: 50%;
    position: fixed;
    top: 50%;
    transform: translate(-50%, -50%);
    width: 300px;
}

.mainCont {
    text-align: center;
}