fixed some bugs

app.py

@@ -50,7 +50,7 @@ def main():
         reset_chat()
 
         # Text input for user prompt
-        user_input = st.text_area("Enter your prompt:", height=100)
+        user_input = st.text_area("Enter your prompt:", height=200)
 
         # Send button
         if st.button("Send"):
@@ -90,3 +90,6 @@ def main():
 
                 # Add Gemini response to chat history
                 st.session_state.messages.append({"role": "assistant", "content": full_response})
+
+if __name__ == "__main__":
+    main()