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CSS

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JavaScript

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Babel includes JSX processing.

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HTML 

              
                <link href="https://fonts.googleapis.com/css?family=Aref+Ruqaa" rel="stylesheet">

        <div id="app">


      <div id="setup">
        <template v-if="showSetup">
            <p class="noselect">Timer Setup:</p>
            <p class="noselect">Work Timer: <input type="text" v-model.number="work"> minutes</p>
            <p class="noselect">Pause Timer: <input type="text" v-model.number="pause"> minutes</p>
        </template>
        <template v-else>
            {{ message }}
        </template>
      </div>


      <div id="clock">
        <template v-if="showClock">
            {{ minutes }} : {{seconds}}<br><br>
          <button type="button" v-on:click="resetClock">Reset</button>
        </template>
        <template v-else>
            <button type="button" v-on:click="startClock">Start</button>
        </template>

      </div>

    </div>
!

CSS 

              
                body {

    background-image: url(http://tomato.trustice.de/webkegtoes.jpg);
    background-repeat: no-repeat;
    background-position: center;
    background-attachment: fixed;
   
}

p {
  margin: 5px;
}

#app {
    font-family: 'Aref Ruqaa', serif;
    font-size: 250%;

    text-shadow: 2px 0 0 #fff, -2px 0 0 #fff, 0 2px 0 #fff, 0 -2px 0 #fff, 1px 1px #fff, -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff;
    margin: 0 auto;
    text-align: center;
}

input {
  width: 75px;
  text-align: center;
  border-style: groove;
  font-size: 100%;
  background: transparent;
  border-color: white;
}

button {
  background: transparent;
  border: none;
  font-size: 100%;
  text-shadow: 2px 0 0 #fff, -2px 0 0 #fff, 0 2px 0 #fff, 0 -2px 0 #fff, 1px 1px #fff, -1px -1px 0 #fff, 1px -1px 0 #fff, -1px 1px 0 #fff;
  border-style: groove;
  border-color: white;
}


.noselect {
  user-select: none;
}
!

JS 

              
                new Vue({
    el: '#app',
    data: {
        work: 25 , //default work time is 25 minutes
        pause: 5 , //default pause time is 5 minutes
        countdown: 0, //declaration here, init later in the timerfunction
        state: 0,  // 0 = idle; 1 = work; 2 = pause;
        showClock: false,
        showSetup: true,
        message: ""
    },
    computed: {
       minutes: function() {
          var mins = Math.floor((this.countdown/60)%60);
          if (mins < 10)
              return '0' + mins;
          else
              return mins;

       },
       seconds: function() {
          var secs = Math.floor(this.countdown%60)
             if (secs < 10)
                 return '0' + secs;
             else
                 return secs;
        }
    },



methods: {
        startClock: function(){
            this.showClock = true;
            this.showSetup = false;
            if (this.state === 0){
                console.log("increasing state to work (state 1)");
                this.state++;
                this.message = "Work!"
                alert('Get to work!');
                console.log("state " + this.state);
                this.countdown = this.work * 60;
                console.log("countdown set to " + this.countdown + " seconds.");
            }
            else if (this.state === 1){
                console.log("increasing state to pause (state 2)");
                this.state++;
                this.message = "Pause!"
                alert('Relax now :)');
                console.log("state " + this.state);
                this.countdown = this.pause * 60;
                console.log("countdown set to " + this.countdown + " seconds.");
            }
            else {
                console.log("state is not work or pause. app on hold");
                stopClock();
            }
            startCount = setInterval(this.timer, 1000);
        },
        timer: function (){
            this.countdown -= 1;
            console.log(this.countdown);
            if (this.countdown === 0 && this.state === 1){
              console.log("work (state 1) done");
              clearInterval(startCount);
              this.startClock();

            }
            else if (this.countdown === 0 && this.state === 2){
              console.log("pause (state 2) finished - stopping clock and set state back to idle (state 0)");
              this.stopClock();

            }

        },

        stopClock: function () {
            clearInterval(startCount);
            this.message = "Session finished"
            alert("Don't forget to start the timer if you go back to working again!")
            console.log("app terminated.")
            this.showClock = false;
            this.showSetup = true;
        },
        resetClock: function () {
            this.showClock = false;
            this.showSetup = true;
            clearInterval(startCount);
            this.countdown = 0;
            this.state = 0;
            console.log("app reseted.")
        }

    }
});
!
999px

Console