Update app.py

app.py

@@ -221,6 +221,7 @@ def send_example(example_text, history, max_tokens, temperature, top_p, qa_chain
 # Custom CSS that forces light mode regardless of browser settings.
 custom_css = """
 :root {
+    --primary-200: transparent !important;
     color-scheme: light !important;
     background-color: #fff !important;
     color: #333 !important;