text: import React from "react";
  import { Link } from "gatsby";
  import Layout from "../components/layout";
  import SEO from "../components/seo";
  
  const NotFoundPage = () => (
    <Layout>
      <SEO title="404: Not found" />
      <h1>ページが見つかりません</h1>
      <p><Link to="/">ホームへ戻る</Link></p>
    </Layout>
  );
  
  export default NotFoundPage;
  