add banner

app.py

@@ -9,13 +9,14 @@ from langchain.chains import ConversationalRetrievalChain
 from htmltemp import css, bot_template, user_template
 from langchain.llms import HuggingFaceHub
 
+api_key = st.secrets['api_key']
 
 def main():
     load_dotenv()
     st.set_page_config(page_title="PDF Chatbot", page_icon="📚")
     custom_html = """
     <div class="banner">
-        <img src="https://www.canva.com/design/DAFys-F940k/2s_2FuK_FCWlBKS8VEWLMA/view?utm_content=DAFys-F940k&utm_campaign=designshare&utm_medium=link&utm_source=editor" alt="Banner Image">
+        <img src="https://huggingface.co/spaces/wiwaaw/summary/resolve/main/banner.png" alt="Banner Image">
     </div>
     <style>
         .banner {
@@ -93,7 +94,7 @@ def get_conversation_chain(vectorstore):
     llm = HuggingFaceHub(
         repo_id="google/flan-t5-large",
         model_kwargs={"temperature": 0.5, "max_length": 1024},
-        
+        huggingfacehub_api_token=api_key
     )
 
     memory = ConversationBufferMemory(memory_key="chat_history", return_messages=True)