body {
	margin: 40px auto;
	max-width: 650px;
	line-height: 1.6;
	font-size: 18px;
	padding: 0 10px;
	background-color: #FFFFFF;
}

img {
	max-width: 650px;
}

h1, h2, h3 {
	line-height: 1.2;
}

pre {
	padding: .5rem;
	margin-left: 1rem;
}