src/App.vue

<script setup>
import { RouterView } from 'vue-router'
</script>

<template>
  <div id="app">

    <main class="app-main">
      <RouterView />
    </main>
  </div>
</template>

<style scoped>
#app {
  min-height: 100vh;
  display: flex;
  flex-direction: column;
}

.app-main {
  flex: 1;
  background-color: var(--background-color);

}
</style>