diff --git a/server.js b/server.js
index 8d72747..3f98c7b 100644
--- a/server.js
+++ b/server.js
@@ -67,18 +67,53 @@ function renderPage(rows, error) {
 <head>
   <meta charset="utf-8">
   <title>NodeJS + Postgres Demo</title>
+  <link rel="icon" href="https://nubes.ru/themes/custom/nubes/images/nubes-ico.svg" type="image/svg+xml">
+  <style>
+    :root { --nubes-blue: #005BFF; --nubes-dark: #1A1A1A; --nubes-grey: #F8F9FA; --nubes-border: #E5E7EB; }
+    body { font-family: 'Segoe UI', Tahoma, sans-serif; margin: 0; padding: 0; background: var(--nubes-grey); color: var(--nubes-dark); }
+    .header-bg { position: sticky; top: 0; z-index: 1000; background: #fff; border-bottom: 1px solid var(--nubes-border); padding: 15px 0; box-shadow: 0 2px 10px rgba(0,0,0,0.05); }
+    .container { max-width: 1000px; margin: auto; padding: 0 20px; }
+    .header-content { display: flex; align-items: center; justify-content: space-between; }
+    .logo { height: 40px; }
+    .main-content { padding: 40px 0; }
+    .card { background: #fff; padding: 32px; border-radius: 16px; box-shadow: 0 4px 20px rgba(0,0,0,0.04); }
+    .btn { display: inline-flex; align-items: center; justify-content: center; cursor: pointer; padding: 12px 24px; border: none; border-radius: 8px; font-weight: 600; font-size: 14px; }
+    .btn-primary { background: var(--nubes-blue); color: #fff; }
+    .btn-action { padding: 12px; background: #fff; border: 1px solid var(--nubes-border); border-radius: 8px; font-size: 18px; line-height: 1; cursor: pointer; min-width: 44px; }
+    .btn-action:hover { background: var(--nubes-grey); border-color: var(--nubes-blue); }
+    .input-group { display: flex; gap: 12px; margin-bottom: 32px; }
+    input[type="text"] { flex-grow: 1; padding: 12px 16px; border: 1px solid var(--nubes-border); border-radius: 8px; font-size: 14px; }
+    table { width: 100%; border-collapse: collapse; }
+    th { text-align: left; padding: 16px; font-size: 12px; text-transform: uppercase; color: #6B7280; border-bottom: 1px solid var(--nubes-border); }
+    td { padding: 16px; border-bottom: 1px solid var(--nubes-border); }
+    tbody tr:nth-child(even) { background-color: #FAFBFC; }
+    tbody tr:hover { background-color: #F3F4F6; }
+    .id-cell { font-family: monospace; color: #9CA3AF; width: 60px; }
+    .actions-cell { display: flex; gap: 12px; width: 130px; }
+  </style>
 </head>
 <body>
-  <h3>NodeJS + Postgres Demo</h3>
-  ${errorHtml}
-  <form method="POST" action="/add">
-    <input type="text" name="txt_content" placeholder="New message">
-    <button type="submit">Add</button>
-  </form>
-  <table border="1" cellpadding="6" cellspacing="0">
-    <tr><th>ID</th><th>Content</th><th>Actions</th></tr>
-    ${rowsHtml}
-  </table>
+  <div class="header-bg">
+    <div class="container header-content">
+      <img src="https://nubes.ru/themes/custom/nubes_2025/logo.svg" alt="Nubes" class="logo">
+      <div style="font-size: 14px; color: var(--nubes-blue); font-weight: 600;">NodeJS + Postgres Demo</div>
+    </div>
+  </div>
+  <div class="container main-content">
+    <div class="card">
+      ${errorHtml}
+      <form method="POST" action="/add" class="input-group" onsubmit="const btn=this.querySelector('button'); if(btn){btn.disabled=true; btn.textContent='Adding...';}">
+        <input type="text" name="txt_content" placeholder="New message" required>
+        <button type="submit" class="btn btn-primary">Add</button>
+      </form>
+      <table>
+        <thead><tr><th>ID</th><th>Content</th><th>Actions</th></tr></thead>
+        <tbody>
+          ${rowsHtml}
+        </tbody>
+      </table>
+    </div>
+  </div>
 </body>
 </html>`;
 }
@@ -118,7 +153,18 @@ async function handleRequest(req, res) {
         await ensureTable();
         if (url.pathname === "/add") {
           const content = form.txt_content || "Node did it";
-          await pool.query("INSERT INTO nubes_test_table (test_data) VALUES ($1)", [content]);
+          const { rows: lastRows } = await pool.query(
+            "SELECT test_data, created_at FROM nubes_test_table ORDER BY id DESC LIMIT 1"
+          );
+          const last = lastRows[0];
+          const isDuplicate =
+            last &&
+            last.test_data === content &&
+            Date.now() - new Date(last.created_at).getTime() < 3000;
+
+          if (!isDuplicate) {
+            await pool.query("INSERT INTO nubes_test_table (test_data) VALUES ($1)", [content]);
+          }
         }
         if (url.pathname === "/update") {
           await pool.query("UPDATE nubes_test_table SET test_data=$1 WHERE id=$2", [
