Contract/src/App.vue

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

export default {
  name: 'App',
  data () {
    return {
    }
  },
  methods: {
  }
}
</script>

<style>
#app {
  font-family: 'Avenir', Helvetica, Arial, sans-serif;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  text-align: center;
  color: #2c3e50;
  height: 100%
}
html,body{
  height:100%
}
</style>