quizEngine/styles.css

html { height: 100%; }

body {
	background-color: #6E5967;
	padding: 0;
	margin: 0;
	height: 100%;
}

div.container {
	display: flex;
	height: 100%;
	align-items: center;
	justify-content: center;
}

canvas#game {
	margin: 0 auto;
	display: block;
}