diff --git a/index.html b/index.html
new file mode 100644
index 0000000..444043d
--- /dev/null
+++ b/index.html
@@ -0,0 +1,46 @@
+<!DOCTYPE html>
+<html>
+  <head>
+    <meta name="viewport" content="width=device-width,initial-scale=1.0">
+    <title>Socket.IO chat</title>
+    <style>
+      body { margin: 0; padding-bottom: 3rem; font-family: -apple-system, BlinkMacSystemFont, "Segoe UI", Roboto, Helvetica, Arial, sans-serif; }
+
+      #form { background: rgba(0, 0, 0, 0.15); padding: 0.25rem; position: fixed; bottom: 0; left: 0; right: 0; display: flex; height: 3rem; box-sizing: border-box; backdrop-filter: blur(10px); }
+      #input { border: none; padding: 0 1rem; flex-grow: 1; border-radius: 2rem; margin: 0.25rem; }
+      #input:focus { outline: none; }
+      #form > button { background: #333; border: none; padding: 0 1rem; margin: 0.25rem; border-radius: 3px; outline: none; color: #fff; }
+
+      #messages { list-style-type: none; margin: 0; padding: 0; }
+      #messages > li { padding: 0.5rem 1rem; }
+      #messages > li:nth-child(odd) { background: #efefef; }
+    </style>
+  </head>
+  <body>
+    <ul id="messages"></ul>
+    <form id="form" action="">
+      <input id="input" autocomplete="off" /><button>Send</button>
+    </form>
+	<script src="/socket.io/socket.io.js"></script>
+	<script>
+	  const socket = io();
+	  const form = document.getElementById('form');
+	  const input = document.getElementById('input');
+	  const messages = document.getElementById('messages');
+
+	  form.addEventListener('submit', (e) => {
+		e.preventDefault();
+		if (input.value) {
+		  socket.emit('chat message', input.value);
+		  input.value = '';
+		}
+	  });
+	  socket.on('chat message', (msg) => {
+		const item = document.createElement('li');
+		item.textContent = msg;
+		messages.appendChild(item);
+		window.scrollTo(0, document.body.scrollHeight);
+	  });
+	</script>
+  </body>
+</html>
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diff --git a/index.js b/index.js
new file mode 100644
index 0000000..cf18681
--- /dev/null
+++ b/index.js
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+const express = require('express');
+const { createServer } = require('node:http');
+const { join } = require('node:path');
+const { Server } = require('socket.io');
+
+const app = express();
+const server = createServer(app);
+const io = new Server(server);
+
+app.get('/', (req, res) => {
+  res.sendFile(join(__dirname, 'index.html'));
+});
+
+io.on('connection', (socket) => {
+  console.log('a user connected');
+  socket.on('chat message', (msg) => {
+    io.emit('chat message', msg);
+	console.log('message: ' + msg);
+  });
+  socket.on('disconnect', () => {
+    console.log('user disconnected');
+  });
+});
+
+server.listen(3000, () => {
+  console.log('server running at http://localhost:3000');
+});
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