body {
	font-family: 'MS UI Gothic';
}

.square_cells {
	width: 30px;
	height: 30px;
	text-align: center;
}

.display_area {
	border: 1px solid;
	width: 500px;
	padding: 10px;
}

.display_tenji {
	border: 1px solid;
	width: 60px;
}

.center_cells {
	text-align: center;
}