JSFiddle - React, Tailwind, and code Playground

by WK_of_Angmar

HTML

<div></div>

CSS

div {
    border: black solid 1px;
    border-radius: 50%;
    height: 300px;
    left: 50%;
    margin-left: -150px;
    position: relative;
    width: 300px;
}

JavaScript

document.getElementsByTagName("div")[0].style.top = (window.innerHeight / 2) - 150 + "px";