fix: small ui issue (#311)

* fix: unnecessary lines before the chats or prompts

Removed unncessary lines if there are no folders before prompts and
chats.

* added the light mode for scroll down button

components/Chat/Chat.tsx

@@ -318,10 +318,10 @@ export const Chat: FC<Props> = memo(
         {showScrollDownButton && (
           <div className="absolute bottom-0 right-0 mb-4 mr-4 pb-20">
             <button
-              className="flex h-7 w-7 items-center justify-center rounded-full bg-gray-700 shadow-md hover:shadow-lg focus:outline-none focus:ring-2 focus:ring-blue-500 dark:bg-gray-700"
+              className="flex h-7 w-7 items-center justify-center rounded-full bg-neutral-200 text-gray-700 shadow-md hover:shadow-lg focus:outline-none focus:ring-2 focus:ring-blue-500 dark:bg-gray-700"
               onClick={handleScrollDown}
             >
-              <IconArrowDown size={18}/>
+              <IconArrowDown size={18} />
             </button>
           </div>
         )}