[fix]: Filter UI (code100x#1825)

Author: SimantaRajSarma

src/components/Sidebar.tsx

@@ -258,7 +258,7 @@ export function Sidebar({
                 Course Content
               </h4>
               <FilterContent
-                className="bg-gray-400 text-black"
+                className="bg-black-400 text-white"
                 ref={filterRef}
               />
               <Button