JSFiddle - React, Tailwind, and code Playground

HTML

<div><p>123123123</p></div>

CSS

div {
    position: relative;
    width: 10%;
    background-color: silver;
    height: 100px;
    margin: 0 auto;
}
p {
    position: relative;
    display: block;
    width: 100px;
    border: 1px solid red;
    left: 50%;
    margin-left: -50px;
    }