diff --git a/kettes.html b/kettes.html
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+++ b/kettes.html
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+<!DOCTYPE html>
+<html lang="en">
+<head>
+    <meta charset="UTF-8">
+    <meta name="viewport" content="width=device-width, initial-scale=1.0">
+    <title>Document</title>
+    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-QWTKZyjpPEjISv5WaRU9OFeRpok6YctnYmDr5pNlyT2bRjXh0JMhjY6hW+ALEwIH" crossorigin="anonymous">
+<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-YvpcrYf0tY3lHB60NNkmXc5s9fDVZLESaAA55NDzOxhy9GkcIdslK1eN7N6jIeHz" crossorigin="anonymous"></script>
+    <link rel="stylesheet" href="szamrendszerp.css">
+</head>
+<body>
+    <nav class="navbar navbar-dark bg-dark fixed-top">
+        <div class="container-fluid">
+          <a class="navbar-brand" href="#">Kettes számrendszer ismertetője</a>
+          <button class="navbar-toggler" type="button" data-bs-toggle="offcanvas" data-bs-target="#offcanvasDarkNavbar" aria-controls="offcanvasDarkNavbar" aria-label="Toggle navigation">
+            <span class="navbar-toggler-icon"></span>
+          </button>
+          <div class="offcanvas offcanvas-end text-bg-dark" tabindex="-1" id="offcanvasDarkNavbar" aria-labelledby="offcanvasDarkNavbarLabel">
+            <div class="offcanvas-header">
+              <h5 class="offcanvas-title" id="offcanvasDarkNavbarLabel">Átváltó, és ismertetők</h5>
+              <button type="button" class="btn-close btn-close-white" data-bs-dismiss="offcanvas" aria-label="Close"></button>
+            </div>
+            <div class="offcanvas-body">
+              <ul class="navbar-nav justify-content-end flex-grow-1 pe-3">
+                <li class="nav-item">
+                  <a class="nav-link active" aria-current="page" href="szamrendszerp.html">Főoldal</a>
+                </li>
+                <li class="nav-item">
+                  <a class="nav-link" href="szamrendszer.html">Átvátó</a>
+                </li>
+                <li class="nav-item dropdown">
+                  <a class="nav-link dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
+                    Ismertetők
+                  </a>
+                  <ul class="dropdown-menu dropdown-menu-dark">
+                    </li>
+                    <li><a class="dropdown-item" href="kettes.html">Kettes számrendszer</a></li>
+                    <li><a class="dropdown-item" href="nyolcas.html">Nyolcas számrendszer</a></li>
+                    <li><a class="dropdown-item" href="tizes.html">Tizes számrendszer</a></li>
+                    <li><a class="dropdown-item" href="tizenhatos.html">Tizenhatos számrendszer</a></li>
+                  </ul>
+                </li>
+              </ul>
+            </div>
+          </div>
+        </div>
+      </nav>
+</body>
+</html>
\ No newline at end of file
