.led {
  margin: 0 auto;
  width: 1em;
  height: 1em;
  border-radius: 50%;
  display: inline-block;
}
.led-red {
  background-color: #F00;
  box-shadow: rgba(0, 0, 0, 0.2) 0 -.1em .2em .1em, inset #441313 0 -.1em .4em, rgba(255, 0, 0, 0.5) 0 .2em .8em;
}
.led-yellow {
  background-color: #FF0;
  box-shadow: rgba(0, 0, 0, 0.2) 0 -.1em .2em .1em, inset #808002 0 -.1em .4em, #FF0 0 .2em .8em;
}
.led-green {
  background-color: #ABFF00;
  box-shadow: rgba(0, 0, 0, 0.2) 0 -.1em .2em .1em, inset #304701 0 -.1em .4em, #89FF00 0 .2em .8em;
}
.led-blue {
  background-color: #24E0FF;
  box-shadow: rgba(0, 0, 0, 0.2) 0 -.1em .2em .1em, inset #006 0 -.1em .4em, #3F8CFF 0 .2em .8em;
}
.led-grey {
  background-color: #EEE;
  box-shadow: rgba(0,0,0,.2) 0 -.1em .2em .1em, inset rgba(0,0,0,.5) 0 -.1em .4em, rgba(0,0,0,.5) 0 .2em .6em;
}
.led-blank {
  background-color: #EEE;
}
.blink-red {
  -webkit-animation: blinkRed 0.5s infinite;
  -moz-animation: blinkRed 0.5s infinite;
  -ms-animation: blinkRed 0.5s infinite;
  -o-animation: blinkRed 0.5s infinite;
  animation: blinkRed 0.5s infinite;
}
.blink-yellow {
  -webkit-animation: blinkYellow 1s infinite;
  -moz-animation: blinkYellow 1s infinite;
  -ms-animation: blinkYellow 1s infinite;
  -o-animation: blinkYellow 1s infinite;
  animation: blinkYellow 1s infinite;
}
@-webkit-keyframes blinkRed {
    from { background-color: #F00; }
    50% { background-color: #A00; box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 7px 1px, inset #441313 0 -1px 9px, rgba(255, 0, 0, 0.5) 0 2px 0;}
    to { background-color: #F00; }
}
@-moz-keyframes blinkRed {
    from { background-color: #F00; }
    50% { background-color: #A00; box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 7px 1px, inset #441313 0 -1px 9px, rgba(255, 0, 0, 0.5) 0 2px 0;}
    to { background-color: #F00; }
}
@-ms-keyframes blinkRed {
    from { background-color: #F00; }
    50% { background-color: #A00; box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 7px 1px, inset #441313 0 -1px 9px, rgba(255, 0, 0, 0.5) 0 2px 0;}
    to { background-color: #F00; }
}
@-o-keyframes blinkRed {
    from { background-color: #F00; }
    50% { background-color: #A00; box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 7px 1px, inset #441313 0 -1px 9px, rgba(255, 0, 0, 0.5) 0 2px 0;}
    to { background-color: #F00; }
}
@keyframes blinkRed {
    from { background-color: #F00; }
    50% { background-color: #A00; box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 7px 1px, inset #441313 0 -1px 9px, rgba(255, 0, 0, 0.5) 0 2px 0;}
    to { background-color: #F00; }
}
@-webkit-keyframes blinkYellow {
    from { background-color: #FF0; }
    50% { background-color: #AA0; box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 7px 1px, inset #808002 0 -1px 9px, #FF0 0 2px 0; }
    to { background-color: #FF0; }
}
@-moz-keyframes blinkYellow {
    from { background-color: #FF0; }
    50% { background-color: #AA0; box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 7px 1px, inset #808002 0 -1px 9px, #FF0 0 2px 0; }
    to { background-color: #FF0; }
}
@-ms-keyframes blinkYellow {
    from { background-color: #FF0; }
    50% { background-color: #AA0; box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 7px 1px, inset #808002 0 -1px 9px, #FF0 0 2px 0; }
    to { background-color: #FF0; }
}
@-o-keyframes blinkYellow {
    from { background-color: #FF0; }
    50% { background-color: #AA0; box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 7px 1px, inset #808002 0 -1px 9px, #FF0 0 2px 0; }
    to { background-color: #FF0; }
}
@keyframes blinkYellow {
    from { background-color: #FF0; }
    50% { background-color: #AA0; box-shadow: rgba(0, 0, 0, 0.2) 0 -1px 7px 1px, inset #808002 0 -1px 9px, #FF0 0 2px 0; }
    to { background-color: #FF0; }
}