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              <div class='container'>
  <h2>Podomoro Session Clock</h2>
  <div class='header'>
  </div>
    <br>
<button class ='test'> Start </button>
<button  class ='stop'> Stop </button>
 
  <br></br>
  <div id="clock" class="col-md-2 circle ">
<h3 id = 'seq'></h3>
  <span id = 'podomoro'>    
  </span>
</div>
    <br>
<div class="row">
 <div class='col-md-6'>
   <p>Break Length</p>
      <button class='subBreak'>-</button>
      <span class='break'> </span>
      <button class='addBreak '>+</button>
     </div>
    
    <div class='col-md-6'>
      <p>Session Length</p>
    <button class='subSession '>-</button>
      <span class='session'> </span>
      <button class='addSession '>+</button>
    </div>
</div>
</div>

            
          
!
            
              /* https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-alpha.6/css/bootstrap.min.css
*/
.container{
  width: 100%;
  margin: 0 auto;
  padding-top: 1.5em;
  padding-bottom: 8em;
  text-align:center;
  background:#3d3838;
  color:#fff;
}

.circle {
  height: 200px;
  padding-top: 2em;
  text-align:center;
  margin: 0 auto;
  border: 1px solid #fff;
  border-radius: 90%;
  border-color: #8bbaed;
}

h2 {
  color:#8bbaed;
}
p {
  font-size: large;
  color: #efa62f;
}

.test, .stop {
  color: red;
}


.subBreak,.addBreak,.subSession,.addSession{
  color: red;
  font-weight: 800;
}

#podomoro {
  font-size: xx-large;
}
            
          
!
            
              //cdnjs.cloudflare.com/ajax/libs/jquery/2.1.3/jquery.min.js
//cdnjs.cloudflare.com/ajax/libs/angular.js/1.3.14/angular.min.js

$(document).ready(function() {  //run jquery on load
  var breakLength = 3;
  var sessionLength = 25;
  $(".break").text(breakLength);
  $('.session').text(sessionLength);
  $('#podomoro').text(sessionLength);
   //break
  document.getElementById('seq').textContent = 'Session';
  $('.addBreak').on('click', function() {
    breakLength = breakLength + 1;
    $('.break').text(breakLength);
  });
  $('.subBreak').on('click', function() {
    breakLength = breakLength - 1;
    $('.break').text(breakLength);
  });
//session
  $('.addSession').on('click', function() {
    sessionLength = sessionLength + 1;
    $('.session').text(sessionLength);
    $('#podomoro').text(sessionLength);
  });
  $('.subSession').on('click', function() {
    sessionLength = sessionLength - 1;
    $('.session').text(sessionLength);
    $('#podomoro').text(sessionLength);
  });

  $('.test').on('click', function() {

    var secs = sessionLength * 60;
    var choice = true;
    var run = setInterval(function() { //The setInterval() method calls a function or evaluates an expression at specified intervals (in milliseconds).
      var h = Math.floor(secs / 3600); //Round a number downward to its nearest integer:
      var m = Math.floor(secs % 3600 / 60);
      var s = Math.floor(secs % 3600 % 60);
      document.getElementById('podomoro').innerHTML = (h < 10 ? '0' : '') + h + ":" + (m < 10 ? '0' : '') + m + ":" + (s < 10 ? '0' : '') + s;
      secs = secs - 1;

      if (secs < 0) {
        if (choice === true) {
          secs = breakLength * 60;
          document.getElementById('seq').textContent = 'Break';
          choice = false;  //getElementById() method returns the element that has the ID attribute with the specified value.
        } else {
          secs = sessionLength * 60;
          document.getElementById('seq').textContent = 'Session';
          choice = true;
        };
      };

    }, 1000);

    $('.stop,.subBreak,.addBreak,.subSession,.addSession').on('click', function() {
      clearInterval(run); //Display the current time (the setInterval() method will execute the function once every 1 second, just like a digital watch). Use clearInterval() to stop time:
    });
     
  }); 

});
            
          
!
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