<h1>A good tip</h1>
	<p>Don't take your guns to town</p>
	<div class="separator" ></div>

/* rem - root em */
html { font-size: 10px; }

.separator {
	width:100%;
	height:100px;
	background:blue;
}

h1 {
	font-size: 30px;
}

p {
	font-size: 20px;
	border: 2px solid blue;
}