diff --git a/_layouts/default.html b/_layouts/default.html
index 41b92b9..a826767 100644
--- a/_layouts/default.html
+++ b/_layouts/default.html
@@ -175,13 +175,21 @@
                         </a>
                     </div>
 
-                    <div class="navbar-collapse collapse">
+                    <nav class="navbar-collapse collapse" aria-label="Hauptnavigation">
                         <div class="container">
-                            <ul class="navbar-inner-wrap2">
-                                <li class=" "><a href="/pytutorial/"><span>Home</span></a></li>
+                            <ul id="mainNavigation" class="nav navbar-nav navbar-main" style="display: flex;">
+                                <li class="navbar-main-all-wrap2">
+                                    <ul class="navbar-main-wrap2" style="max-width: 1109px;">
+                                        <li>
+                                            <ul class="navbar-inner-wrap2">
+                                                <li class=" "><a href="/pytutorial/"><span>Home</span></a></li>
+                                            </ul>
+                                        </li>
+                                    </ul>
+                                </li>
                             </ul>
                         </div>
-                    </div>
+                    </nav>
                 </div>
             </div>
         </header>