app/src/components/Settings.vue

<template>
  <div class="settings">
    <div class="time">
      <p>Kies het aantal seconden:</p>
      <span class="time-choice" v-on:click="setTime(15)">15</span>
      <span class="time-choice" v-on:click="setTime(30)">30</span>
      <span class="time-choice" v-on:click="setTime(45)">45</span>
      <span class="time-choice" v-on:click="setTime(60)">60</span>
      <span class="time-choice" v-on:click="setTime(75)">75</span>
      <span class="time-choice" v-on:click="setTime(90)">90</span>
    </div>
  </div>
</template>

<script>
export default {
  name: "Settings",
  props: {
    time: {
      type: Number,
      default: 0
    }
  },
  methods: {
    setTime(number) {
      this.$emit('set-time', number);
    }
  }
}
</script>

<style lang="scss">
  .time-choice {
    font-size: 32px;
    display: inline-block;
    padding: 25px;
  }
</style>