Fix dark/light theme toggle functionality

Author: Arpitawork24

web-app/css/styles.css

@@ -921,6 +921,7 @@ body {
         bottom: 1rem;
         width: 3rem;
         height: 3rem;
+    }
 
     .search-wrapper {
         max-width: 100%;
@@ -1072,4 +1073,4 @@ body {
     .modal-close:hover {
         transform: none;
     }
-}
+}

web-app/js/main.js

@@ -61,7 +61,7 @@ backToTopButton.addEventListener('click', () => {
 });
 
 // Category Filtering
-const tabs = document.querySelectorAll('.tab');
+// const tabs = document.querySelectorAll('.tab');
 
 // Category Filtering (tabs)