body {
	font-family: tahoma;
	color: green;
	text-align: center;
  background-image: url('tchu.jpg');
  background-repeat: repeat;


}
.matrix {
	/*border: 1px dashed black;*/
	padding: 2px;
	margin: 0px auto 0px auto;
	text-align: center;
}

.cell {
	border: 1px dotted black;
	position: relative;
	float: left;
	background: white;
}

.cell span {
	position: relative;
	top: 25%;
}

div.cell[locked="false"]:hover {
	background: #CCFFAA;
	border: 1px solid white;
}

.cell[locked="true"] {
	background: #CCDDAA;
	color: #00CC00;
}