diff --git a/e2e/flyer.spec.js b/e2e/flyer.spec.js
index c6f1f05..59a4bed 100644
--- a/e2e/flyer.spec.js
+++ b/e2e/flyer.spec.js
@@ -176,6 +176,19 @@ test.describe("VoxVera static client", () => {
     await expect(headers.nth(0).locator(".sort-indicator")).toContainText("▲");
   });
 
+  test("bulletin board assets use root-absolute paths (cleanUrls/trailingSlash safe)", async ({ page }) => {
+    await page.goto("/board.html");
+    const refs = await page.evaluate(() =>
+      Array.from(document.querySelectorAll("link[href], script[src]"))
+        .map((n) => n.getAttribute("href") || n.getAttribute("src")));
+    expect(refs.length).toBeGreaterThan(0);
+    // Vercel serves this page at /board/ — relative asset paths would resolve
+    // to /board/... and 404, leaving the page unstyled with no scripts.
+    for (const ref of refs) {
+      expect(ref, `asset "${ref}" must be root-absolute or external`).toMatch(/^(https?:|\/)/);
+    }
+  });
+
   test("bulletin board language selector localizes the page", async ({ page }) => {
     await page.goto("/board.html");
     await expect(page.locator("#board-title")).toHaveText("Bulletin Board");
diff --git a/site/board.html b/site/board.html
index b9b5e47..3ffa2b8 100644
--- a/site/board.html
+++ b/site/board.html
@@ -4,7 +4,10 @@
     <meta charset="UTF-8">
     <meta name="viewport" content="width=device-width, initial-scale=1">
     <title>VoxVera — Bulletin Board</title>
-    <link rel="stylesheet" href="nostr-client.css">
+    <!-- Root-absolute asset paths: with Vercel cleanUrls + trailingSlash this
+         page is served at /board/, so relative paths would resolve to
+         /board/... and 404. -->
+    <link rel="stylesheet" href="/nostr-client.css">
   </head>
   <body class="board-page">
     <header class="topbar">
@@ -13,7 +16,7 @@
         <p id="board-subtitle">Most recent flyers published to the relays.</p>
       </div>
       <div class="topbar-controls">
-        <a id="board-back" class="board-back" href="./">Back to VoxVera</a>
+        <a id="board-back" class="board-back" href="/">Back to VoxVera</a>
         <select id="board-lang" aria-label="Language"></select>
       </div>
     </header>
@@ -24,8 +27,8 @@
         <tbody id="board-rows"></tbody>
       </table>
     </main>
-    <script src="locales.js"></script>
-    <script src="vendor/nostr-tools/nostr.bundle.js"></script>
-    <script src="board.js"></script>
+    <script src="/locales.js"></script>
+    <script src="/vendor/nostr-tools/nostr.bundle.js"></script>
+    <script src="/board.js"></script>
   </body>
 </html>