JSFiddle - React, Tailwind, and code Playground

HTML

<div>
  <img src="http://images.clipartpanda.com/envelope-with-letter-clipart-envelope-md.png" />
</div>

CSS

div {
  width: 500px;
  height: 500px;
  background-color: #aaf;
  position: relative;
}

JavaScript

$("img").css({
  "top": $("div").height() / 2 - $("img").height() / 2,
  "left": $("div").width() / 2 - $("img").width() / 2,
	"position": "absolute"
});