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              <div class="container-fluid">
  <div id="title" class="text-center">
    <h1>Pomodoro Clock</h1>
    <p>By <a href="https://codepen.io/aaronyoung/">Aaron Young</a>
  </div> <!-- title -->
  
  <div class="text-center">
    <button id="clock" type="button" class="btn btn-default">
      <span id="status">Session</span>
      </br></br>
      <span id="clock-time">25</span>
    </button>
  </div>  <!-- clock -->
  
  <div class="row">
    <div class="col-xs-6">
      <table id="break" class="time-table">
        <tr>
          <td colspan="6"><h3 class="text-center">Break Time</h3></td>
        </tr>
        <tr>
          <td><button id="break-minus" type="button" class="btn btn-default plus-minus">-</button></td>
          <td><span id="break-length">5</span></td> 
          <td><button id="break-plus" type="button" class="btn btn-default plus-minus">+</button></td>
        </tr>
      </table>     
    </div> <!-- Break time -->
    
    <div class="col-xs-6">
      <table class="time-table">
        <tr>
          <td colspan="3"><h3 class="text-center">Session Time</h3></td>
        </tr>
        <tr>
          <td><button id="session-minus" type="button" class="btn btn-default plus-minus">-</button></td>
          <td><span id="session-length">25</span></td> 
          <td><button id="session-plus" type="button" class="btn btn-default plus-minus">+</button></td>
        </tr>
      </table>        
    </div> <!-- Session Time -->
    
    <div class="text-center">
      <button id="reset" type="button" class="btn btn-danger">Reset</button>
    </div> <!-- Reset -->
  
  </div> <!-- Options container -->
</div>

<!-- audio -->
<audio id="alarm">
  <source src="https://cs.oberlin.edu/~syoung/audio/alarm_ring.mp3" type="audio/mpeg">
</audio>

<audio id="ticking">
  <source src="https://cs.oberlin.edu/~syoung/audio/alarm_tick.mp3" type="audio/mpeg">
</audio>
            
          
!
            
              body {
  background: grey;
}

button {
  outline-style: none !important;
  font-weight: 200;
}

h1, h3, p {
  color: white;
  font-weight: 200;
}

span {
  font-weight: 200;
}

a {
  color: #6EC6CF;
  text-decoration: none !important;
  font-weight: 200;
}

#clock {
  height: 213px;
  width: 213px;
  border-radius: 50%;
  font-size: 150%;
  background: white;
}

td {
    height: 50px; 
    width:50px;
}

.time-table td {
  text-align:center; 
  vertical-align:middle;
}

.plus-minus {
  border-radius: 50%;
}

#break {
  float: right;
}

#reset {
  width: 50%;
  margin-top: 10px;
}

            
          
!
            
              var breakTime = 5;
var sessionTime = 25;
var Break = false;
var sessionTimeSec = 25 * 60;
var sessionBase = 25 * 60;
var pause = true;
var counter = setInterval(timer, 1000);

$(document).ready(function(){
  $("#break-minus").on("click", subBreakTime);
  $("#break-plus").on("click", addBreakTime);
  $("#session-minus").on("click", subSessionTime);
  $("#session-plus").on("click", addSessionTime);
  $("#clock").on("click", timerClicked);
  $("#reset").on("click", resetClock);
});

function subBreakTime() {
  if (breakTime > 0) {
    breakTime--;
    $("#break-length").html(breakTime);
  }
  if (Break) {
    sessionTimeSec = breakTime * 60;
    sessionBase = breakTime * 60;
  }
}

function addBreakTime() {
  if (breakTime < 60) {
    breakTime++;
    $("#break-length").html(breakTime);
  }
  if (Break) {
    sessionTimeSec = breakTime * 60;
    sessionBase = breakTime * 60;
  }
}

function subSessionTime() {
  if (sessionTime > 0) {
    sessionTime--;
    $("#session-length").html(sessionTime);
  }
  if (!Break) {
    sessionTimeSec = sessionTime * 60;
    sessionBase = sessionTime * 60;
    $("#clock-time").html(sessionTime);
  }
}

function addSessionTime() {
  if (sessionTime < 60) {
    sessionTime++;
    $("#session-length").html(sessionTime);
  }
  if (!Break) {
    sessionTimeSec = sessionTime * 60;
    sessionBase = sessionTime * 60;
    $("#clock-time").html(sessionTime);
  }
}

function timerClicked() {
  if (pause) {
    $("#ticking")[0].play();
    pause = false;
  } else {
    pause = true;
  }
}

// http://stackoverflow.com/questions/1191865/code-for-a-simple-javascript-countdown-timer
function timer() {
  if (sessionTimeSec <= 0) {
     clearInterval(sessionTimeSec);
     //counter ended, do something here
     timesUp();
  } else if (!pause) {
    sessionTimeSec=sessionTimeSec-1;
    displayRemainingTime(sessionTimeSec);
  }
}

function displayRemainingTime(time) {
  var mins = Math.floor(time/60);
  time -= Math.floor(time/60) * 60;
  if (mins < 10) {
    mins = "0" + mins;
  }
  var sec = time;
  if (time < 10) {
    sec = "0" + sec;
  }
  $("#clock-time").html(mins + ":" + sec);
  
  // display progress
  var remaining = sessionTimeSec/sessionBase;
  if (remaining > 0.9) {
    $("#clock").css("background", "linear-gradient(210deg, #FFF 100%, #6EC6CF 0%)");
  } else if (remaining > 0.8) {
    $("#clock").css("background", "linear-gradient(210deg, #FFF 90%, #6EC6CF 10%)");
  } else if (remaining > 0.7) {
    $("#clock").css("background", "linear-gradient(210deg, #FFF 80%, #6EC6CF 20%)");
  } else if (remaining > 0.6) {
    $("#clock").css("background", "linear-gradient(210deg, #FFF 70%, #6EC6CF 30%)");
  } else if (remaining > 0.5) {
    $("#clock").css("background", "linear-gradient(210deg, #FFF 60%, #6EC6CF 40%)");
  } else if (remaining > 0.4) {
    $("#clock").css("background", "linear-gradient(210deg, #FFF 50%, #6EC6CF 50%)");
  } else if (remaining > 0.3) {
    $("#clock").css("background", "linear-gradient(210deg, #FFF 40%, #6EC6CF 40%)");
  } else if (remaining > 0.2) {
    $("#clock").css("background", "linear-gradient(210deg, #FFF 30%, #6EC6CF 30%)");
  } else if (remaining > 0.1) {
    $("#clock").css("background", "linear-gradient(210deg, #FFF 20%, #6EC6CF 20%)");
  } else if (remaining > 0) {
    $("#clock").css("background", "linear-gradient(210deg, #FFF 0%, #6EC6CF 0%)");
  }
}

function timesUp() {
  $("#alarm")[0].play();
  $("#clock").css("background", "white");
  if (Break) {
    $("#status").html("Session");
    resetClock();
  } else {
    // time for break
    $("#status").html("Break");
    Break = true;
    sessionTimeSec = breakTime * 60;
    sessionBase = breakTime * 60;
    $("#clock-time").html(breakTime);
  }
}

function resetClock() {
  sessionTimeSec = sessionTime * 60;
  sessionBase = sessionTime * 60;
  pause = true;
  Break = false;
  $("#status").html("Session");
  $("#clock-time").html(sessionTime);
}
            
          
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