.cluster-circle {
	background-clip: padding-box;
    font: 12px "Helvetica Neue", Arial, Helvetica, sans-serif;
}

.cluster-circle > div {
    width: 40px;
    height: 40px;

    text-align: center;
    border-radius: 20px;
}

.cluster-circle > div > div {
    display: inline-block;
	margin-top: 5px;
	width: 30px;
	height: 30px;

	text-align: center;
	border-radius: 15px;
	font: 12px "Helvetica Neue", Arial, Helvetica, sans-serif;
}

.cluster-circle span {
	line-height: 30px;
}