.rect-ctar {
	overflow:hidden;
	position:relative;
	min-height:500px;
	background-color:black;
}
.rect-board {
	position:absolute;
	width:3000px;
	height:3000px;
	background-color:#ffc;
}
.rect {
	box-sizing:content-box;
	display:inline-block;
	margin:5px;
	padding:0;
	width:100px;
	height:100px;
	text-align:center;
	font-family: Texta, sans-serif;
	font-size: 3.0em;
	font-weight: bold;
	color:white;
	background-color:#080;
}