index.css

html,
body {
	padding: 0;
	margin: 0;
	background: transparent;
}

/* Use OS default fonts */
body {
	font-family: -apple-system,
		BlinkMacSystemFont,
		'Segoe UI',
		Roboto,
		Oxygen-Sans,
		Ubuntu,
		Cantarell,
		'Helvetica Neue',
		sans-serif,
		'Apple Color Emoji',
		'Segoe UI Emoji',
		'Segoe UI Symbol';
	text-rendering: optimizeLegibility;
	font-feature-settings: 'liga', 'clig', 'kern';
}

header {
	position: absolute;
	width: 500px;
	height: 250px;
	top: 50%;
	left: 50%;
	margin-top: -125px;
	margin-left: -250px;
	text-align: center;
}

header h1 {
	font-size: 60px;
	font-weight: 200;
	margin: 0;
	padding: 0;
	opacity: 0.7;
}