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HTML

            
              <header>
  <h3>Your time is limited, so don't waste it living someone else's life.</h3>
</header>
<p id="quoteAuthor">Steve Jobs</p>
<div class="container">
<div class="section">
        <div class="content clearfix">
          <div class="card effect hourEf" data-id="1">
            <div class="front">
              <span class="hour time">front</span>
            </div>
            <div class="back">
              <span class="hour time">back</span>
            </div>
          </div><!-- /card -->
          <div class="card effect minuteEf" data-id="1">
            <div class="front">
              <span class="minute time">front</span>
            </div>
            <div class="back">
              <span class="minute time">back</span>
            </div>
          </div><!-- /card -->

          <div class="card effect secondEf" data-id="1">
            <div class="front">
              <span class="second time">front</span>
            </div>
            <div class="back">
              <span class="second time">back</span>
            </div>
          </div><!-- /card -->
      </div><!-- /section -->
  
  </div>
!

CSS

            
              body {
    background: #1d1d1e;
}

header{
  font-family: 'Architects Daughter', cursive;
  font-size:25px;
  display: flex;
  flex-direction: column;
  justify-content: center;
  align-items: center;
  text-align: center;
  color: rgba(128,128,128,1);
  text-shadow: 1px 1px 0 rgba(140,140,140,0.6) , -1px -1px 1px rgba(0,0,0,0.67) ;
}

#quoteAuthor{
  font-family: 'Architects Daughter', cursive;
  font-size:25px;
  color: rgba(58,58,58,1);
  text-shadow: 1px 1px 0 rgba(140,140,140,0.6) , -1px -1px 1px rgba(0,0,0,0.67) ;
  text-align:right;
  padding-right: 15%;
}
.content {
  display: flex;
  flex-direction: row;
  justify-content: center;
  align-items: center;
  padding-bottom: 5%
}

/**
 * The cards
 *
 * Each card plays home to a front and back. I've set them up as squares here
 * by using the padding technique, but you may set them up in any dimensions
 * you like based on your site design.
 */
.card {
  position: relative;
  float: left;
  padding-bottom: 35%;
  width: 25%;
  text-align: center;
  perspective: 600px;
}

.front,
.back {
  background-color: black;
  position: absolute;
  top: 0;
  left: 0;
  width: 100%;
  height: 100%;
  -webkit-box-shadow: 5px 5px 11px 0px rgba(0,0,0,0.59);
-moz-box-shadow: 5px 5px 11px 0px rgba(0,0,0,0.59);
box-shadow: 5px 5px 11px 0px rgba(0,0,0,0.59);
  -webkit-backface-visibility: hidden; /* Chrome, Safari, Opera */
    backface-visibility: hidden;
}

.back {
  -webkit-transform: rotateX(-180deg);
          transform: rotateX(-180deg);
}

.time{
  position: absolute;
  top: 0;
  right: 0;
  bottom: 0;
  left: 0;
  margin: auto;
  height: 20px;
  font-family: 'Rationale', sans-serif;
  font-size:15vw;
  line-height: 20px;
  color:white; }
 
.card.effect.flipped .front {
  -webkit-transition: -webkit-transform 0.5s;
          transition: transform 0.5s;
  transition-timing-function: linear;
  -webkit-transform: rotateX(-180deg);
          transform: rotateX(-180deg);
}
.card.effect.flipped .back {
  -webkit-transition: -webkit-transform 0.5s;
          transition: transform 0.5s; 
  transition-timing-function: linear;
  -webkit-transform: rotateX(10deg);
          transform: rotateX(-359deg);
}
!

JS

            
              /*
 *By Suleyman Tekin 02/07.2017
 */

var minute, hour, sec;
function setup(){
  var date = new Date();
  sec = addZero(date.getSeconds());
  minute = addZero(date.getMinutes());
  hour = addZero(date.getHours());
  showSecond();
  if(sec==00){
    showMinute();
    if(minute == 59){
      showHour();
    }
  }
}

function showSecond(){
  $('.card.effect.secondEf').hasClass( "flipped" )  === true ? $('.card.effect.secondEf').removeClass("flipped") : $('.card.effect.secondEf').addClass("flipped");
  $('.second').text(sec);
 
}

function showMinute(){
  $('.card.effect.minuteEf').hasClass( "flipped" )  === true ?      $('.card.effect.minuteEf').removeClass("flipped") :     $('.card.effect.minuteEf').addClass("flipped");
  if($('.minuteEf .front').is(':visible')) {
      $('.back .minute').text(minute);
      $('.front .minute').text(addZero(minute-1));
  }else{
      $('.front .minute').text(minute);
      $('.back .minute').text(addZero(minute-1));
  }  
}

function showHour(){
   
  $('.card.effect.hourEf').hasClass( "flipped" )  === true ? $('.card.effect.hourEf').removeClass("flipped") : $('.card.effect.hourEf').addClass("flipped");
  $('.hour').text(hour);
}

setup();
setInterval(setup, 500);
showSecond();
showMinute();
showHour();

function addZero(a){
  if(a == -1){return "00";}
  if(a <10){
    return "0" + a;
  }
  return a;
}
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