body {
	background-color:lightcyan;
}
#game {
	display:flex;
	flex-direction:column;
	justify-content:center;
	align-items:center;
}
.row {
	display:flex;
}
.cell {
	width:18vmin;
	height:18vmin;
	margin:1vmin;
	border:solid 1vmin transparent; /* orange */
	border-radius:50%;
	display:flex; /* centre butterfly */
	justify-content:center;
	align-items:center;
}
.cell img {
	width:80%;
	height:80%;
}