.Led {
  display:inline-block;
  width: 50px;
  height: 75px;
  background-image: url(img/ledoff.png);
  background-repeat: no-repeat;
}

.ledon {
  background: url(img/ledon.png);
  background-repeat: no-repeat;
}

.led_disabled {
  background: url(img/ledoff.png);
  background-repeat: no-repeat;
  cursor: not-allowed;
  opacity: 0.4;
}