#block-panel {
	position: absolute;
	width: 400px;
	height: 600px;
	background-color: teal;
	left: 50%;
	margin-left: -200px;
	overflow: hidden;
}

.block-part {
	width: 36px;
	height: 36px;
	border: 2px solid #eee;	
	position: absolute;
}

.red {
	background-color: red;	
}

.blue {
	background-color: blue;
}

.green {
	background-color: green;
}

.yellow {
	background-color: yellow;
}