Demo

style.css
index.html

/* Click `index.html` to see the HTML. */

p { color: red; }

blockquote { color: blue; }

footer { background-color: lightgray; }

/* This is a “wildcard,” targeting any element. */
* { color: gray; }

<!DOCTYPE html>
<html>
	<head>
		<title>Element</title>
		<link href="style.css" rel="stylesheet">
	</head>
	<body>
		<h1>This heading will be gray</h1>
		<p>This paragraph will be red.</p>
		<blockquote>This blockquote will be blue.</blockquote>
		<p>This paragraph will also be red.</p>
		<footer>
			<blockquote>This blockquote, also blue, nested in a gray footer.</blockquote>
			<a href="#">A gray link, from the wildcard</a>
		</footer>
	</body>
</html>