25x25 checker board css

checkerboard.css

.box-wrapper {
	width: 250px;
	height: 250px;
}

.box-wrapper > .box{
	background: #000;
	width: 8px;
	height: 8px;
	float: left;
	margin: 1px;
}

.box-wrapper > .box-alt {
	background: #999;
}

.box-wrapper > .box:hover {
	background: #00ff00;
}

.box-wrapper > .highlight {
	background: #00ff00 !important;
}

.box-wrapper > .box.highlight-locked {
	background-color: red;
}