Demo

style.css
index.html

body, section { padding: 20px; }

section {
	background-color: gold;
	display: flex;
	justify-content: center;
}

img {
	display: block;
	width: 60%;
}

<!DOCTYPE html>
<html>
	<head>
		<meta name="viewport" content="width=device-width, initial-scale=1">
		<link href="/assets/styles/reset.css" rel="stylesheet">
		<link href="style.css" rel="stylesheet">
	</head>
	<body>
		<section>
			<img src="tim.jpg" alt="Tim Berners-Lee at a computer.">
		</section>
	</body>
</html>