body {
	font-family: sans-serif;
	line-height: 1.25em;
	margin: 0 auto;
	padding-bottom: 1em;
	background: #ccc;

	max-width: 140ex;
}

nav, main { background: white; }

nav {
	position: sticky;
	top: 0;
	padding-bottom: 0.5em;
	border-style: outset;
	border-width: 0 0 1px;
}
nav p { margin: 0 1em; }

main {
	padding: 1em;
	max-width: 180ex;
	background-color: white;
}

img { max-width: 100%; }


*:last-child { margin-bottom: 0; }
p:first-child { margin-top: 0; }
p { margin-bottom: 0; }