table, div, td {
	margin: 0 auto;
	text-align: center;
}
table {
	border-collapse: collapse;
}
td {
	border:1px solid black;
	width: 30px;
	height: 30px;
}
td.row_mark {
	background-color: #F5DA81
}
td.col_mark {
	background-color: orange;
}
td.assigned {
	background-color: #FE642E;
}
td.freezero {
	background-color: green;
}
td.row_labels, td.col_labels {
	background-color: #ddd;
}