diff --git a/astro.config.mjs b/astro.config.mjs
index cb9c3ee..3a16534 100644
--- a/astro.config.mjs
+++ b/astro.config.mjs
@@ -19,7 +19,9 @@ export default defineConfig({
     },
   },
   output: "hybrid",
-  adapter: cloudflare(),
+  adapter: cloudflare({
+    mode: "directory",
+  }),
   build: {
     inlineStylesheets: "auto",
   },
diff --git a/src/functions/post/_middleware.tsx b/functions/post/_middleware.tsx
similarity index 99%
rename from src/functions/post/_middleware.tsx
rename to functions/post/_middleware.tsx
index 43e7e10..c4d5be9 100644
--- a/src/functions/post/_middleware.tsx
+++ b/functions/post/_middleware.tsx
@@ -82,7 +82,6 @@ const OgImage = ({ ogTitle }: OgImageProps): JSX.Element => {
     </div>
   );
 };
-
 const getFontData = async (url: string): Promise<ArrayBuffer> => {
   const css = await (
     await fetch(url, {
@@ -92,11 +91,9 @@ const getFontData = async (url: string): Promise<ArrayBuffer> => {
       },
     })
   ).text();
-
   const resource = css.match(
     /src: url\((.+)\) format\('(opentype|truetype)'\)/
   );
-
   if (resource === null) {
     throw new Error("Font resource not found");
   }
diff --git a/src/pages/404.astro b/src/pages/404.astro
new file mode 100644
index 0000000..248188e
--- /dev/null
+++ b/src/pages/404.astro
@@ -0,0 +1,8 @@
+---
+import Layout from "../layouts/Layout.astro";
+---
+
+<Layout title="404 Not Found" description="ページが見つかりませんでした。">
+  <h1 class="text-4xl">404 Not Found</h1>
+  <p>ページが見つかりませんでした。</p>
+</Layout>