Update app.py

app.py

@@ -585,7 +585,7 @@ def create_demo_interface():
     
     with gr.Blocks(
         title="Vector RAG Demo - Сбер 2023",
-        theme=gr.themes.Default(),
+        theme=gr.themes.Soft(),
         css="""
         .main-header { text-align: center; margin-bottom: 2rem; }
         .feature-box { background-color: #f8f9fa; padding: 1rem; border-radius: 8px; margin: 1rem 0; }