style.css

div#memory_board{
	background: #CCC;
	border: #999 1px`;
	width: 800px;
	height: 540px;
	padding: 25px;
	margin: 0px auto;
}

div#memory_board > div{
	background: url("chip.png") no-repeat;
	border: #000 1 px solid;     
	width: 71px;
	height: 71px;
	float: left; 
	margin: 10px;
	padding: 20px;
	font-size: 64px;
	cursor: pointer;
	text-align: center;                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                                             

}