diff --git a/index.html b/index.html
index 250f671..f8975a4 100644
--- a/index.html
+++ b/index.html
@@ -14,10 +14,10 @@ <h1>Git - Software Configuration Managment (SCM)</h1>
     <button onclick="changeBg();">Change Background</button>
     <h2>Git Topics</h2>
     <ul>
-        <li>Merge</li>
-        <li>Rebase</li>
-        <li>Squash</li>
-        <li>Distributed workflow</li>
+        <li><a href="https://git-scm.com/docs/git-merge">Merge</a></li>
+        <li><a href="https://git-scm.com/docs/git-rebase">Rebase</a></li>
+        <li><a href="https://www.javatpoint.com/git-squash">Squash</a></li>
+        <li><a href="https://git-scm.com/book/ms/v2/Distributed-Git-Distributed-Workflows">Distributed workflow</a></li>
     </ul>
 </body>
 </html>
diff --git a/scripts.js b/scripts.js
index 5ec3a13..7352012 100644
--- a/scripts.js
+++ b/scripts.js
@@ -1,3 +1,10 @@
+let isLightBlue = false;   // Initial background color 
 function changeBg() {
-    document.body.style.backgroundColor = "lightblue"; 
-}
+    // Check the current background color and toggle it 
+    if (isLightBlue) {
+        document.body.style.backgroundColor = ""; // Default color 
+    } else {
+        document.body.style.backgroundColor = "lightblue";
+    }
+    isLightBlue = !isLightBlue; // Toggle the boolean flag 
+}
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