app_vue2/components/Layout/Container.vue

<template>
  <v-container fluid class="container">
    <v-row justify="center" align="center">
      <v-col cols="12" sm="12" md="12">
        <slot></slot>
      </v-col>
    </v-row>
  </v-container>
</template>

<script lang="ts">
  import {defineComponent, reactive} from '@nuxtjs/composition-api'

  export default defineComponent({
    setup() {
      return {
      }
    }
  })
</script>

<style scoped>
  .container{
    padding: 30px;
  }
</style>