.icon-checkbox-checked {
    display: inline-block;
    height: 16px;
    width: 16px;
    background: no-repeat url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAxUlEQVQ4jc3TsQ2DQAyFYc/AAAxjsUNGoKFzkYqClur6w91NwABIdMxghMQQ7l+qIEWJkiNKkSf97Se5MNHfLMZ4UVXkNgzD9QFQVez7npWZQVXxEnD3t63rCgDfAV3XgZm/A0QEzIx5ns8DIgIiwjiOcPfPQNM0CCHA3bEsC4gIInKAb4G2bUFEICKklMDMKMsS0zTlAe6Ouq5RFMUBVVX1cNJHYNs2pJQOpO/7c8C9EAKYGWaWB5gZcvcEnP2FGOOFfrEb9Zkb93kAX9cAAAAASUVORK5CYII=")
}

.icon-checkbox-unchecked {
    display: inline-block;
    height: 16px;
    width: 16px;
    background: no-repeat url("data:image/png;base64,iVBORw0KGgoAAAANSUhEUgAAABAAAAAQCAYAAAAf8/9hAAAAW0lEQVQ4jcXTQQrAMAhE0Rzd44oQJCAiAWkP0FlMaKEDf/t2M8YXE5HrtAdwMgh0Nx0E9t50EKgqOghkJh0EIoIOAmstOgi4Ox0E5px0EDAzOgioKh0EXn3h190CTEnNmH4n7QAAAABJRU5ErkJggg==")
}