Update app.py

app.py

@@ -1207,6 +1207,7 @@ with gr.Blocks(
     title="Agent Feynman",
     css="""
     h1 {text-align: center}
+    h2 {text-align: center}
     #lecture-container {font-family: 'Times New Roman', Times, serif;}
     #slide-content {font-size: 48px; line-height: 1.2;}
     #form-group {box-shadow: 0 0 2rem rgba(0, 0, 0, .14) !important; border-radius: 30px; font-weight: 900; color: #000; background-color: white;}