diff --git a/index.html b/index.html
index dde1d47..f8902f0 100644
--- a/index.html
+++ b/index.html
@@ -39,11 +39,11 @@
           Courses
         </a>
                 <div class="dropdown-menu" aria-labelledby="navbarDropdown">
-                    <a class="dropdown-item" href="#">Big Data</a>
-                    <a class="dropdown-item" href="#">Machine Learning</a>
-                    <a class="dropdown-item" href="#">DevOps</a>
-                    <a class="dropdown-item" href="#">Cloud Computing</a>
-                    <a class="dropdown-item" href="#">Web Development</a>
+                    <a class="dropdown-item" href="course-main-page.html/#big_data">Big Data</a>
+                    <a class="dropdown-item" href="course-main-page.html/#machine_learning">Machine Learning</a>
+                    <a class="dropdown-item" href="course-main-page.html/#devops">DevOps</a>
+                    <a class="dropdown-item" href="course-main-page.html/#cloud_computing">Cloud Computing</a>
+                    <a class="dropdown-item" href="course-main-page.html/#web_development">Web Development</a>
                 </div>
                 
             </li>