src/App.vue

```vue
<template>
  <div id="app">
    <custom-navbar />
    <router-view />
    <custom-footer />
  </div>
</template>

<script>
import CustomNavbar from './components/CustomNavbar.vue'
import CustomFooter from './components/CustomFooter.vue'

export default {
  name: 'App',
  components: {
    CustomNavbar,
    CustomFooter
  }
}
</script>
```