JSFiddle - React, Tailwind, and code Playground

HTML

<!DOCTYPE html>
<html>
<head>
	<title>HTML Positioning Test</title>
	<meta charset="utf-8"/>
</head>
<body>
	<div id="container">
		<div id="box">
			box
		</div>
	</div>
</body>
</html>

CSS

#container {
		width: 500px;
		height: 500px;
		background-color: gray;
    position:fixed;
	}
#box {
		width: 100px;
		height: 100px;
		background-color: orange;
		margin-top: 30px;
		margin-left: 30px;
	}