Update app.py

app.py

@@ -68,7 +68,7 @@ def load_css():
         margin-top: 20px;
     }
     .stExpander {
-        background: white;
+        background: black;
         border-radius: 10px;
         box-shadow: 0 4px 8px rgba(0, 0, 0, 0.1);
     }