Update app.py

app.py

@@ -4,19 +4,29 @@ from pytube import YouTube
 class YouTubeDownloader:
     @staticmethod
     def run():
-        st.header("YouTube Video Downloader")
+        st.title("YouTube Video Downloader")
+        st.write("")
+        
+        # Navigation Bar
+        nav_option = st.sidebar.radio("Navigation", ["Login", "Sign Up"])
+        if nav_option == "Login":
+            # Login button functionality
+            st.sidebar.button("Login")
+        elif nav_option == "Sign Up":
+            # Sign Up button functionality
+            st.sidebar.button("Sign Up")
+        
         url = st.text_input("Enter YouTube URL to download:")
         if url:
             YouTubeDownloader.validate_url(url)
-            with st.expander("preview video"):
+            with st.expander("Preview Video"):
                 st.video(url)
             if st.button("Download"):
                 YouTubeDownloader.cleanup()
                 file_ = YouTubeDownloader.download_video(url)
                 st.video(file_)
                 YouTubeDownloader.helper_message()
-        st.markdown(" App made by miles")
-
+        st.markdown("App made by miles")
 
     @staticmethod
     def download_video(url):
@@ -54,6 +64,5 @@ class YouTubeDownloader:
             "click the vertical ... icon (aka hamburger button) in the bottom-right corner (in the video above) and click download."
         )
 
-
 if __name__ == "__main__":
-    YouTubeDownloader.run()
+    YouTubeDownloader.run()