diff --git a/demo/index.html b/demo/index.html
index 612b4f0..797d492 100644
--- a/demo/index.html
+++ b/demo/index.html
@@ -18,7 +18,9 @@
 
       button {
         margin-top: 10px;
-        font-family: system,-apple-system,"BlinkMacSystemFont",".SFNSText-Regular","San Francisco","Roboto","Segoe UI","Helvetica Neue","Lucida Grande","Ubuntu","arial",sans-serif;
+        font-family: system, -apple-system, "BlinkMacSystemFont",
+          ".SFNSText-Regular", "San Francisco", "Roboto", "Segoe UI",
+          "Helvetica Neue", "Lucida Grande", "Ubuntu", "arial", sans-serif;
         background-color: rgba(20, 20, 25);
         border: 1px solid rgba(60, 60, 70);
         border-radius: 12px;
@@ -27,7 +29,7 @@
         font-size: 14px;
         padding: 12px 16px;
         text-align: center;
-        transition: transform .2s, background-color .2s, border-color .2s;
+        transition: transform 0.2s, background-color 0.2s, border-color 0.2s;
         width: fit-content;
       }
 
@@ -41,7 +43,7 @@
       }
 
       button:active {
-        transform: scale(.98)
+        transform: scale(0.98);
       }
       .source {
         color: black;
@@ -77,11 +79,12 @@
       >Source code</a
     >
   </body>
-  
+
+  <!--
   <script src="https://cdn.jsdelivr.net/npm/@cap.js/widget"></script>
   <script src="https://cdn.jsdelivr.net/npm/@cap.js/widget/cap-floating.min.js"></script>
-  
-  <!-- to use local resources, uncomment this: -->
-  <!-- <script src="/cap.js"></script>
-       <script src="/cap-floating.js"></script> -->
+  -->
+
+  <script src="/cap.js"></script>
+  <script src="/cap-floating.js"></script>
 </html>
diff --git a/demo/package.json b/demo/package.json
index 2abf940..d71ad76 100644
--- a/demo/package.json
+++ b/demo/package.json
@@ -12,7 +12,6 @@
   },
   "dependencies": {
     "@cap.js/server": "^1.0.5",
-    "@fastify/static": "^8.1.1",
     "fastify": "^5.2.1"
   }
 }
diff --git a/demo/server.js b/demo/server.js
index 4c99670..24c0d3b 100644
--- a/demo/server.js
+++ b/demo/server.js
@@ -1,6 +1,6 @@
+import fs from "fs";
 import path from "path";
 import Cap from "@cap.js/server";
-import fastifyStatic from "@fastify/static";
 import Fastify from "fastify";
 
 const fastify = Fastify();
@@ -8,21 +8,19 @@ const cap = new Cap({
   tokens_store_path: ".data/tokensList.json",
 });
 
-fastify.register(fastifyStatic, {
-  root: path.join(__dirname),
-  prefix: "/",
-});
-
 fastify.get("/", (req, res) => {
-  res.sendFile("index.html");
+  res.header("Content-Type", "text/html");
+  res.send(fs.createReadStream(path.join(__dirname, "index.html")));
 });
 
 fastify.get("/cap.js", (req, res) => {
-  res.sendFile("../widget/src/cap.js");
+  res.header("Content-Type", "application/javascript");
+  res.send(fs.createReadStream(path.join(__dirname, "../widget/src/cap.js")));
 });
 
 fastify.get("/cap-floating.js", (req, res) => {
-  res.sendFile("../widget/src/cap-floating.js");
+  res.header("Content-Type", "application/javascript");
+  res.send(fs.createReadStream(path.join(__dirname, "../widget/src/cap-floating.js")));
 });
 
 fastify.post("/api/challenge", (req, res) => {
diff --git a/server/index.test.js b/server/index.test.js
deleted file mode 100644
index ba28a7d..0000000
--- a/server/index.test.js
+++ /dev/null
@@ -1,77 +0,0 @@
-const express = require('express');
-const crypto = require('crypto');
-const Cap = require('./index.js');
-
-const app = express();
-app.use(express.json());
-
-const cap = new Cap({
-  tokens_store_path: '.data/tokensList.json'
-});
-
-function solveChallenge(salt, target) {
-  let nonce = 0;
-  while (true) {
-    if (crypto.createHash('sha256').update(salt + nonce.toString()).digest('hex').startsWith(target)) {
-      return nonce.toString();
-    }
-    nonce++;
-  }
-}
-
-app.post('/api/challenge', (req, res) => {
-  res.json(cap.createChallenge({
-    challengeCount: 2,
-    challengeSize: 16,
-    challengeDifficulty: 3,
-    expiresMs: 300000
-  }));
-});
-
-app.post('/api/redeem', async (req, res) => {
-  const { token, solutions } = req.body;
-  if (!token || !solutions) {
-    return res.status(400).json({ success: false });
-  }
-  res.json(await cap.redeemChallenge({ token, solutions }));
-});
-
-app.post('/api/validate', async (req, res) => {
-  const { token } = req.body;
-  if (!token) {
-    return res.status(400).json({ success: false });
-  }
-  res.json(await cap.validateToken(token));
-});
-
-async function test() {
-  const { challenge, token } = await fetch('http://localhost:3000/api/challenge', {
-    method: 'POST'
-  }).then(r => r.json());
-
-  const solutions = challenge.map(([salt, target]) => [salt, target, solveChallenge(salt, target)]);
-  const { success, token: verToken } = await fetch('http://localhost:3000/api/redeem', {
-    method: 'POST',
-    headers: { 'Content-Type': 'application/json' },
-    body: JSON.stringify({ token, solutions })
-  }).then(r => r.json());
-
-  if (!success || !verToken) {
-    throw new Error('Failed to redeem challenge');
-  }
-
-  const validation = await fetch('http://localhost:3000/api/validate', {
-    method: 'POST',
-    headers: { 'Content-Type': 'application/json' },
-    body: JSON.stringify({ token: verToken })
-  }).then(r => r.json());
-
-  if (!validation.success) {
-    throw new Error('Failed to validate token');
-  }
-
-  console.log('All tests passed!');
-  process.exit(0);
-}
-
-app.listen(3000, test);
\ No newline at end of file