body {
    margin: 40px auto;
    max-width:650px;
    line-height:1.6;
    color: #454545;
    padding:0 10px
}

article {
    border-top: 1px solid black;
    margin-top: 2em;
}

@media (orientation: portrait) {
    body {
	max-width: none;
	margin-left: 2em;
	margin-right: 2em;
    }
    
    article {
	border-top: 2px solid black;
	margin-top: 3em;
    }
}

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