JSFiddle - React, Tailwind, and code Playground

HTML

<div class="parent">
    <div class="child">Center me</div>
</div>

CSS

.parent {
    position: absolute;
    top: 50px;
    left: 50px;
    
    width: 400px;
    height: 160px;
    
    padding: 10px;
    text-align: center;
    
    border: 2px solid #444444;
    background-color: #FF0000;
    
    display: table;
}

.child {
    display: table-cell;
    
    color: #123456;
    
    font-family: Arial;
    font-size: 16px;
    
    vertical-align: middle;
}