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HTML

              
                <div class="container">
  <h1 class="text-center">
    Jack's awesome countdown clock.
  </h1>

  <h3 class="text-center">
    I want to countdown <select class="min-select" id="countId">
      <option value="1">
        1
      </option>
      <option value="2">
        2
      </option>
      <option value="3">
        3
      </option>
      <option value="4">
        4
      </option>
      <option value="5">
        5
      </option>
      <option value="6">
        6
      </option>
      <option value="7">
        7
      </option>
      <option value="8">
        8
      </option>
      <option value="9">
        9
      </option>
      <option value="10">
        10
      </option>
      <option value="11">
        11
      </option>
      <option value="12">
        12
      </option>
      <option value="13">
        13
      </option>
      <option value="14">
        14
      </option>
      <option value="15">
        15
      </option>
      <option value="16">
        16
      </option>
      <option value="17">
        17
      </option>
      <option value="18">
        18
      </option>
      <option value="19">
        19
      </option>
      <option value="20">
        20
      </option>
      <option value="21">
        21
      </option>
      <option value="22">
        22
      </option>
      <option value="23">
        23
      </option>
      <option value="24">
        24
      </option>
      <option value="25">
        25
      </option>
      <option value="26">
        26
      </option>
      <option value="27">
        27
      </option>
      <option value="28">
        28
      </option>
      <option value="29">
        29
      </option>
      <option value="30">
        30
      </option>
      <option value="31">
        31
      </option>
      <option value="32">
        32
      </option>
      <option value="33">
        33
      </option>
      <option value="34">
        34
      </option>
      <option value="35">
        35
      </option>
      <option value="36">
        36
      </option>
      <option value="37">
        37
      </option>
      <option value="38">
        38
      </option>
      <option value="39">
        39
      </option>
      <option value="40">
        40
      </option>
      <option value="41">
        41
      </option>
      <option value="42">
        42
      </option>
      <option value="43">
        43
      </option>
      <option value="44">
        44
      </option>
      <option value="45">
        45
      </option>
      <option value="46">
        46
      </option>
      <option value="47">
        47
      </option>
      <option value="48">
        48
      </option>
      <option value="49">
        49
      </option>
      <option value="50">
        50
      </option>
      <option value="51">
        51
      </option>
      <option value="52">
        52
      </option>
      <option value="53">
        53
      </option>
      <option value="54">
        54
      </option>
      <option value="55">
        55
      </option>
      <option value="56">
        56
      </option>
      <option value="57">
        57
      </option>
      <option value="58">
        58
      </option>
      <option value="59">
        59
      </option>
      <option value="60">
        60
      </option>
    </select> minutes
  </h3>

  <!-- show Display -->
  <div class="container clock">
    <div class="row row-centered">
      <div class="col-xs-6 clock-display">
        <h3 id="time_left">
          00:00
        </h3>
      </div>
    </div><!-- end Display -->
  
    <!-- show Buttons -->
    <div class="row row-centered">
      <div class="col-sm-6 buttons">
        <button class="btn btn-start" id="playpause">Start</button>
      </div>

      <div class="col-sm-6 buttons">
        <button class="btn btn-reset" id="reset">Reset</button>
      </div>
    </div><!-- end Buttons -->
  </div>
</div><!-- end Container -->
              
            
!

CSS

              
                body {
  font-family: 'Roboto Slab',serif;
  font-weight: 700;
  background-color: #CBE9F2;
}

.clock {
  background-color: #F0F8FF;
  border: 4px solid #EFEFEF;
  border-radius: 5px;
  -webkit-box-shadow: 0 7px 4px #777;
          box-shadow: 0 7px 4px #777;
  margin-top: 100px;
  padding-bottom: 25px;
  padding-top: 15px;
  width: 50%;
}

.row-centered {
  text-align: center;
}

.clock-display {
  background: rgba(0,0,0,0.06);
  border-radius: 3px;
  webkit-box-shadow: inset 0 4px rgba(0,0,0,0.2);
         box-shadow: inset 0 4px rgba(0,0,0,0.2);
  display: inline-block;
  float: none;
  margin-top: 20px;
  width: 80%;
}

.buttons {
  margin-top: 20px;
}

.btn-start,.btn-reset {
  background: #C4E3F9;
  -webkit-box-shadow: 0 2px 0 0 #269BD0;
             box-shadow: 0 2px 0 0 #99F;
  font-weight: 700;
  height: 35px;
  padding: 4px 20px 0;
  width: 70%;
}

.btn-start:hover,.btn-reset:hover {
  background-color: #8AC7F4;
}

.btn-start:active,.btn-reset:active {
  -webkit-box-shadow: 0 2px 0 0 #B0CCE0;
          box-shadow: 0 2px 0 0 #B0CCE0;
}

.btn-start:before,.btn-reset:before {
  background: #B0CCE0;
  border-right: solid 1px #B0CCE0;
  -webkit-box-shadow: 0 5px 0 0 #B0CCE0;
          box-shadow: 0 5px 0 0 #B0CCE0;
}

.btn-start:active:before,.btn-reset:active:before {
  -webkit-box-shadow: 0 5px 0 0 #B0CCE0,6px 4px 2px rgba(0,0,0,0.3);
          box-shadow: 0 5px 0 0 #B0CCE0,6px 4px 2px rgba(0,0,0,0.3);
}
              
            
!

JS

              
                /*
 * Welcome to my awesome countdown clock!
 */
var counterSelect = document.getElementById('countId'),
        playpause = document.getElementById('playpause'),
            reset = document.getElementById('reset');

/*
 * Provide conditions for initial state.
 */
var counterValue = counterSelect.value * 60,
         playing = false;
renderTime(counterValue);

/*
 * Render a timestamp on the page.
 */
function renderTime(seconds) {
  document.getElementById('time_left').innerHTML = secondsToTime(seconds);
}

/*
 * Output a human readable timestamp given an inital value.
 */
function secondsToTime(seconds) {
    var hours = Math.floor(seconds / 3600);
    seconds -= hours * 3600;
    var minutes = Math.floor(seconds / 60);
    seconds -= minutes * 60;
    if (hours < 1) {
      return leadingZero(minutes) + ':' + leadingZero(seconds);
    } else {
      return hours + ':' + leadingZero(minutes) + ':' + leadingZero(seconds);
    }
}

/*
 * Determine where to place the zeros in a time stamp.
 */
function leadingZero(Time) {
    return (Time < 10) ? "0" + Time : + Time;
}

/*
 * Count down to zero given an initial value.
 */
function countDownFrom(seconds) {
    var audio = new Audio('https://bit.ly/2hQOjct');
    if (playing) {
      if (seconds > 0) {
        setTimeout(function() {
          counterValue = countDownFrom(seconds = seconds - 1)
          renderTime(seconds);
        }, 1000);
      } else {
        audio.play();
        playing = false;
        seconds = 0;
      }
    }
    return seconds;
  }

/* 
 * Handle play/pause click events.
 * Begin or pause the countdown.
 */
playpause.onclick = function() {
  if (!playing) {
    playing = true;
    countDownFrom(counterValue);
    playpause.innerHTML = "Pause";
  } else {
    playpause.innerHTML = "Play";
    playing = false;
  }
};

/*
 * Reset the countdown to the value on the select field.
 * Also pauses the countdown.
 */
reset.onclick = function() {
    playing = false;
    renderTime(selectedCounterValue())
    counterValue = selectedCounterValue();
    playpause.innerHTML = "Start";
  }

/*
 * React to change events on the select field.
 * i.e. change the time rendered and reset the counterValue.
 */
counterSelect.onchange = function(e) {
  renderTime(counterValue = selectedCounterValue());
};

/*
 * Retrieve the current value of the select field.
 */
function selectedCounterValue() {
    return counterSelect.value * 60;
}
              
            
!
999px

Console