styles.css

* {
	box-sizing: border-box;
}

#main-content {
	width: 100%;
	max-width: 600px;
	margin: 0 auto;
	font-family: HelveticaNeue, Helvetica, Arial, sans-serif;
	color: #444;
}

h4 {
	margin-top: 3em;
	padding-top: 3em;
	border-top: 1px solid #DEDEDE;
}

img {
	max-width: 100%;
	margin: 0 auto;
}

p, li {
	font-size: 16px;
	line-height: 1.8em;
}

a {
	color: #27757b;
	border-bottom: 1px dotted #27757b;
	text-decoration: none;
}

a:hover {
	border-bottom: none;
}

@media (max-width: 640px) {
	#main-content {
		padding: 0 20px;
	}
}

@media (print) {
	#main-content {
		max-width: none;
	}
}