初始版本

src/pages/ErrorNotFound.vue

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+<template>
+  <div class="fullscreen bg-blue text-white text-center q-pa-md flex flex-center">
+    <div>
+      <div style="font-size: 30vh">
+        404
+      </div>
+
+      <div class="text-h2" style="opacity:.4">
+        Oops. Nothing here...
+      </div>
+
+      <q-btn
+        class="q-mt-xl"
+        color="white"
+        text-color="blue"
+        unelevated
+        to="/"
+        label="Go Home"
+        no-caps
+      />
+    </div>
+  </div>
+</template>
+
+<script>
+import { defineComponent } from 'vue'
+
+export default defineComponent({
+  name: 'ErrorNotFound'
+})
+</script>

src/pages/IndexPage.vue

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+<template>
+  <q-page class="flex flex-center">
+    <img
+      alt="Quasar logo"
+      src="~assets/quasar-logo-vertical.svg"
+      style="width: 200px; height: 200px"
+    >
+  </q-page>
+</template>
+
+<script>
+import { defineComponent } from 'vue'
+
+export default defineComponent({
+  name: 'IndexPage'
+})
+</script>