#example {
	width: 100%;
	max-width: 820px;
	min-width: 120px;
	height: 300px;
	position: relative;
	overflow: hidden;
	border: 2px dashed #ccc;
	box-sizing: content-box;
}

#example > div {
	width: 100px;
	height: 100px;
	display: block;
	position: absolute;
	background: #346ac0;
	cursor: move;
}