app_vue2/components/Layout/Alert/Container.vue

<template>
  <main class="alertContainer">
    <LayoutAlertContent
      v-for="(alert, key) in alerts"
      :key="key"
      class="alertContent"
      :alert="alert"
    />
  </main>
</template>

<script lang="ts">
import { defineComponent, computed, ComputedRef } from '@vue/composition-api'
import { useContext } from '@nuxtjs/composition-api'
import { alert } from '~/types/interfaces'

export default defineComponent({
  setup () {
    const { store } = useContext()

    const alerts:ComputedRef<Array<alert>> = computed(() => {
      return store.state.page.alerts
    })
    return {
      alerts
    }
  }
})
</script>

<style scoped>
  .alertContainer {
    position: fixed;
    bottom: 0;
    right: 20px;
    z-index: 1000;
  }

  .alertContainer > .alertContent {
    position: relative;
    margin-bottom: 10px;
  }
</style>