.cust-chess {
	background-image: linear-gradient(45deg, #EFEFEF 25%, transparent 25%), linear-gradient(-45deg, #EFEFEF 25%, transparent 25%), linear-gradient(45deg, transparent 75%, #EFEFEF 75%), linear-gradient(-45deg, transparent 75%, #EFEFEF 75%);
	background-size: 20px 20px;
	background-position: 0 0, 0 10px, 10px -10px, -10px 0px;
}