table#sudoku {
	font-family: Arial, Helvetica, sans-serif;
	margin: 1em auto;
	border-collapse: collapse;
	border: 3px solid #000;
}
table#sudoku td {
	width: 2em;
	height: 2em;
	font-size: 2em;
	text-align: center;
	border: 1px solid #000;
}
table#sudoku td.right_border {
	border-right: 3px solid #000;
}
table#sudoku td.bottom_border {
	border-bottom: 3px solid #000;
}
table#sudoku td.hover {
	color: #fff;
	background-color: #ff0000;
}
table#sudoku td.click {
	background-color: #ccc;
}
table#sudoku td.read_only {
	background-color: #d7d7d7;
}
table#sudoku td input {
	color: #000;
	text-align: center;
	font-size: 1em;
	background-color: #ccc;
	border: 0;
	width: 1em;
	height: 1em;
}
#winner {
	text-align: center;
	color: #cc5500;
}
#invalid_move {
	position: absolute;
}