.cluster{background:#2d84c8;border-radius:50%;text-align:center;color:white;font-family:monospace}.cluster:before{content:' ';position:absolute;border-radius:50%;z-index:-1;top:1px;left:1px;right:1px;bottom:1px;border:1px solid white}.digits-1{font-size:14px;height:28px;width:28px;line-height:28px;margin-top:-14px;margin-left:-14px}.digits-2{font-size:16px;height:34px;width:34px;line-height:35px;margin-top:-17px;margin-left:-17px}.digits-2:before{border-width:2px}.digits-3{font-size:18px;height:48px;width:47px;line-height:47px;border-width:3px;margin-top:-24px;margin-left:-24px}.digits-3:before{border-width:3px}.digits-4{font-size:18px;height:58px;width:58px;line-height:57px;border-width:4px;margin-top:-29px;margin-left:-29px}.digits-4:before{border-width:4px}