JSFiddle - React, Tailwind, and code Playground

HTML

<div class="popup-center">
    <div class="content">
        sadalshd<br />
        sadalshd<br />
        <img src="http://www.lorempixel.com/200/200" />
        sadalshd<br>
    </div>
</div>

CSS

.popup-center {
    position: absolute;
    top: 50%;
    left: 50%;
}
.popup-center div {
    margin-left: -50%;
    margin-top: -50%;
}