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              <div id="clock" class="center">
  H J L L Y A V R O K M S<br/>
  <span class="active">I T</span> E <span class="active">I S</span> B P W C V A Q<br/> X <span class="min m15">A</span> M <span class="min m15">Q U A R T E R</span> S T<br/>
  <span class="min m20 m25 m35 m40">T W E N T Y</span> V <span class="min m5">F I V E</span> P<br/>
  <span class="min m30">H A L F</span> Y <span class="min m10 m50">T E N</span> Z S <span class="before">T O</span><br/> P <span class="after">P A S T</span> I X <span class="hour h9">N I N E</span> S<br/>
  <span class="hour h1">O N E</span> <span class="hour h6">S I X</span> M <span class="hour h3">T H R E E</span><br/>
  <span class="hour h4">F O U R</span> Y <span class="hour h5">F I V E</span> <span class="hour h2">T W O</span><br/>
  <span class="hour h8">E I G H T</span> C <span class="hour h11">E L E V E N</span><br/>
  <span class="hour h7">S E V E N</span> D <span class="hour h0">T W E L V E</span><br/> H <span class="hour h10">T E N</span> Q O <span class="min m0">O C L O C K</span><br/> A M D N J L W F H L A T
</div>
            
          
!
            
              @import url("https://fonts.googleapis.com/css?family=PT+Mono");

$current: #dddd55;
$disable: rgba(0,0,0,0.5);
$time: 3600s;

html,
body {
  background: #106020;
  font-family: "PT Mono", courier, "courier new", sans-serif;
  font-size: 16px;
  font-weight: bold;
  color: $disable;
}

#clock {
  white-space: nowrap;
}

.center {
  position: absolute;
  top: 50%;
  left: 50%;
  transform: translate(-50%, -50%);
  -webkit-transform: translate(-50%, -50%);
  -moz-transform: translate(-50%, -50%);
}

.active {
  color: $current;
}

@keyframes m0m30 {
  0% { color: $current; }
  8.33333% { color: $disable; }
}

@keyframes m5m25m35m55 {
  0% { color: $disable; }
  8.33333% { color: $current; }
  16.66666% { color: $disable; }
  41.66666% { color: $current; }
  50% { color: $disable; }
  58.33333% { color: $current; }
  66.66666% { color: $disable; }
  91.66666% { color: $current; }
}

@keyframes m10m50 {
  0% { color: $disable; }
  16.66666% { color: $current; }
  25% { color: $disable }
  83.33333% { color: $current; }
  91.66666% { color: $disable; }
}

@keyframes m20m25m35m40 {
  0% { color: $disable; }
  33.33333% { color: $current; }
  50% { color: $disable; }
  58.33333% { color: $current; }
  75% { color: $disable; }
}

@keyframes m15m45 {
  0% { color: $disable; }
  25% { color: $current; }
  33.33333% { color: $disable; }
  75% { color: $current; }
  83.33333% { color: $disable; }
}

@keyframes past {
  0% { color: $disable; }
  8.33333% { color: $current; }
  58.33333% { color: $disable; }
  100% { color: $disable; }
}

@keyframes to {
  0% { color: $disable; }
  58.33333% { color: $current; }
  100% { color: $current; }
}

.m0, .m30 {
  animation: infinite m0m30 step-end $time;
}

.m30 {
  animation-delay: $time/2;
}

.h0, .h1, .h2, .h3, .h4, .h5, .h6, 
.h7, .h8, .h9, .h10, .h11, .h12 {
  animation: infinite m0m30 step-end ($time * 12);
  animation-delay: -$time/2;
}

.m5 {
  animation: infinite m5m25m35m55 step-end $time;
}

.m10, .m50 {
  animation: infinite m10m50 step-end $time;
}

.m20, .m25, .m35, .m40 {
  animation: infinite m20m25m35m40 step-end $time;
}

.m15, .m45 {
  animation: infinite m15m45 step-end $time;
}

.after {
  animation: infinite past step-end $time;
}

.before {
  animation: infinite to step-end $time;
}

$k: 0;
@while $k < 60 {
  .minute#{$k} {
    $l: 0;
    @while $l < 60 {
      .m#{$l} {
        animation-delay: - $time * $k / 60;
      }
      $l: $l + 5;
    }
    
    .before,
    .after { animation-delay: -$time * $k / 60; }
    .m30 { animation-delay: $time/2 - $time * $k / 60; }
    
    @for $i from 0 through 11 {
      &.hour#{$i} {
        @for $j from 0 through 11 {
          .h#{$j} { animation-delay: (-$time*5/12 + $time*($j - $i)) -  ($time * $k / 60); }
        }
      }
    }
  }
  $k: $k + 5;
}


            
          
!
            
              /**
 * This code is just to set the initial timing, it could be done on the server side without needing any JS
 */
var date = new Date();
var minutes = 5 * Math.round(date.getMinutes() / 5);
var hours = date.getHours() % 12;

document.getElementById("clock").classList.add("minute" + minutes);
document.getElementById("clock").classList.add("hour" + hours);
            
          
!
999px
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