Update app.py

app.py

@@ -22,10 +22,10 @@ css = """
     border-color: #21293b !important;
 }
 .dark.user {
-    background: #1e293b !important;
+    background: #0a1120 !important;
 }
 .dark.assistant, .dark.pending {
-    background: #0f172a !important;
+    background: transparent !important;
 }
 """