App.Vue as a single-file component

App.Vue

<template>
  <div id="app">
    <main>
      <router-view></router-view>
    </main>
  </div>
</template>

<script>
  export default {
    name: 'app'
  }
</script>

<style>
  body {
    margin: 0;
  }

  #app {
    font-family: 'Avenir', Helvetica, Arial, sans-serif;
    -webkit-font-smoothing: antialiased;
    -moz-osx-font-smoothing: grayscale;
    color: #2c3e50;
  }
  
  /* Additional styling here */
</style>