app/src/App.vue

<template>
  <div id="app">
    <p class="error" v-if="wakeLockAvailable == false">Wake lock not available</p>
    <Settings v-if="time == 0" v-on:set-time="setTime" v-on:set-playsound="setPlaySound"/>
    <Timer v-if="time != 0" v-bind:time="time" v-bind:playsound="playsound"/>
  </div>
</template>

<script>
import Settings from './components/Settings.vue'
import Timer from './components/Timer.vue'

export default {
  name: 'App',
  components: {
    Timer,
    Settings
  },
  data: function() {
    return {
      time: 0,
      playsound: false,
      wakeLockAvailable: this.hasWakeLock()
    }
  },
  methods: {
    setTime(number) {
      this.time = number;
    },
    setPlaySound(state) {
      this.playsound = state;
    },
    hasWakeLock() {
      if ('wakeLock' in navigator) {
        return true;
      } else {
        return false;
      }
    }
  }

}
</script>

<style lang="scss">

html, body {
  background-image: url("~@/img/background.png");
  background-size: cover;
  height: 100%;
  margin: 0;
}
#app {
  font-family: "HelveticaNeue", "Helvetica Neue", Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: $white;
  height: 100%;
}

.error {
  background: $light-red;
  border: 1px solid $dark-red;
  padding: 5px;
  color: $dark-red;
  margin: 5px;
}
</style>