html,
body {
	margin: 0;
	padding: 24px;

	font-size: 24px;
	font-family: Arial, Helvetica, sans-serif;
	line-height: 1.6;

	color: #333;
}

main {
	max-width: 1200px;
	margin: 0 auto;
}

h1 {
	text-align: center;
}

a {
	color: #333;
}

.pro {
	color: green;
}

.cons {
	color: tomato;
}

.chapter {
	padding: 24px;
	margin: 32px 0;

	background-color: #c6e2ff;
}