#board {
	border: 0.2rem solid #000;
	width: min-content;
}

#board > div {
	display: flex;
}

#board > div > div {
	width: 2rem;
	height: 2rem;
}

#board > div:nth-child(2n) > div:nth-child(2n+1),
#board > div:nth-child(2n+1) > div:nth-child(2n) {
	background-color: #000;
}

#board > div > div.highlighted {
	background-color: red !important;
}