Update app.py

app.py

@@ -260,7 +260,7 @@ theme = gr.themes.Ocean(
     font=[gr.themes.GoogleFont("Inter"), "Segoe UI", "sans-serif"],
     font_mono=[gr.themes.GoogleFont("Fira Code"), "monospace"]
 )
-
+DOX_LOGO = "https://raw.githubusercontent.com/AzzamAlnatsheh/DDS_BuildingAIChallenge/main/Dox_Image.png"
 demo_css = """
 .chatbot {
     font-family: 'Inter', 'Segoe UI', sans-serif !important;
@@ -282,6 +282,20 @@ demo_css = """
     font-family: 'Inter', 'Segoe UI', sans-serif !important;
     font-size: 13px !important;
 }
+
+.main-container {
+    max-width: 1250px;
+    margin: auto;
+}
+
+.header-card {
+    background: #020E28;
+    border-radius: 24px;
+    padding: 26px;
+    box-shadow: 0 16px 40px rgba(15, 23, 42, 0.08);
+    border: 1px solid #e5e7eb;
+    margin-bottom: 20px;
+}
 """
 
 # Create the Gradio interface using `gr.Blocks` for a custom layout.