.blk {
	width: 50px;
	height: 50px;
	overflow: hidden;
}

.card {
	margin: 5px;
	padding: 5px;
	width: 40px;
	height: 40px;
	border: solid 1px #cccccc;
	font-weight: bold;
	font-size: 20px;
}

.back {
	background: #cccccc;
	cursor: pointer;
}

.cf1  {
	background: #a9c728;
	color: #000000;
}

.cf2  {
	background: #419bd8;
	color: #000000;
}

.cf3  {
	background: #e7d710;
	color: #000000;
}