JSFiddle - React, Tailwind, and code Playground

JavaScript

const scrollbarSize = (function () {
	const d = document.createElement("div");
	let size;
	d.style.overflow = "scroll";
	d.style.padding = d.style.border = "0";
	document.body.appendChild(d);
	size = d.offsetHeight - d.clientHeight;
	document.body.removeChild(d);
	return size;
})();