Make a div round

gistfile1.css

/* to make a div round, the width and height must be the same (a square)
also, the border radius must be half of the w/h
so for a div 42x42, the radius should be 21. */

.my-round-div {
	background-image: url("my-square-or-round-image.png");
	
	display: block;
	height: 42px;
	width: 42px;
	border-radius: 21px;
}