Update app.py

app.py

@@ -24,6 +24,16 @@ st.set_page_config(
     layout="wide"
 )
 
+# Main App
+if "theme_mode" not in st.session_state:
+    st.session_state.theme_mode = st.get_option("theme.base")
+
+# Check for changes in theme mode
+current_theme_mode = st.get_option("theme.base")
+if current_theme_mode != st.session_state.theme_mode:
+    st.session_state.theme_mode = current_theme_mode
+    st.experimental_rerun()
+
 os.environ["OPENAI_API_KEY"] = os.getenv("OPENAI_API_KEY")
 mongo_uri = os.getenv("MONGO_URI_RAG_RECIPE")