Update app.py

app.py

@@ -41,7 +41,7 @@ with gr.Blocks(
     with gr.Sidebar(visible=False):
         gr.HTML("<div style='text-align:center;overflow:hidden;'><h3>PDF Summarizer</h3></div>")
         gr.HTML("<br>")
-        api_key = gr.Text(label=gr.HTML("<div style='text-align:center;overflow:hidden;'><h4>Gemini API Key</h4></div>"), placeholder="Enter your Google Gemini API key here")
+        api_key = gr.Text(label=gr.Markdown("<center><strong>Gemini API Key</strong></center>"), placeholder="Enter your Google Gemini API key here")
         
     with gr.Row():
         pdf_input = gr.File(file_types=[".pdf"])