JSFiddle - React, Tailwind, and code Playground

HTML

<div id="wrapper">
  <div id="child">Child div</div>
</div>

CSS

#wrapper {
    margin: 0 auto;
    width: 200px;
    background-color: #eee;
    position: relative;
    height: 200px;
}
#child {
    position: absolute;
    top: 0;
    left: 50%;
    margin: 0 0 0 -200px;
    width: 400px;
    background-color: #ddd;
}