debug.html.erb

<style media="screen" type="text/css">
.placeholder {
	background: #ccff00;
	padding: 30px 5px;
	clear: both;
}

.layout {
	overflow: auto;
}

.layout > .region:nth-child(1) {
	float: left;
	width: 50%;
}

.layout > .region:nth-child(2) {
	float: right;
	width: 47%;
}

.part {
	clear: both;
	background: #ccc;
	padding: 30px 5px;
	margin: 5px;
}
</style>

	<div data-type="region" class="region" id="root">
		<div data-type="part" class="part">
			Part 1
		</div>
		<div data-type="layout" class="layout">
			<div data-type="region" class="region">
				<div data-type="part" class="part">
					Part 2
				</div>
			</div>
			<div data-type="region" class="region">
				<div data-type="part" class="part">
					Part 3
				</div>
				<div data-type="part" class="part">
					Part 4
				</div>
			</div>
		</div>
		<div data-type="part" class="part">
			Part 5
		</div>
	</div>