body {
	outline: none;
	background-color: #000;
	color: #fff;
}

.left {
	float: left;
}

.clear {
	clear: both;
}

#playingfield {
	padding: 20px;
	width: 600px;
	background-color: #000;
	margin: 0 auto;
}

.box {
	width: 198px;
	height: 198px;
	border: solid 1px #f00;
	color: #fff;
	font-size: 200px;
	font-family: Arial;
	line-height: 200px;
	text-align: center;
}

#box-a1 {
	border-top: none;
	border-left: none;
}

#box-a2 {
	border-top: none;
}

#box-a3 {
	border-top: none;
	border-right: none;
}

#box-b1 {
	border-left: none;
}

#box-b3 {
	border-right: none;
}

#box-c1 {
	border-left: none;
	border-bottom: none;
}

#box-c2 {
	border-bottom: none;
}

#box-c3 {
	border-bottom: none;
	border-right: none;
}