JSFiddle - React, Tailwind, and code Playground

by Codemonkey

HTML

<div id="popup">
    I have a fixed size and can therefore easily be centred
</div>

CSS

#popup
{
    position: absolute;
    left: 50%;
    top: 50%;
    width: 400px;
    height: 200px;
    margin-left: -200px;
    margin-top: -100px;
    
    background-color: #abcdef;
}