Update app.py

app.py

@@ -78,6 +78,18 @@ st.markdown("""
         padding-top: 0;
     }
     
+    /* Fix gap caused by sidebar collapse button */
+    .stSidebar > div:first-child {
+        margin-top: -1rem !important;
+    }
+    
+    /* Specifically target the button that collapses sidebar */
+    button[kind="header"] {
+        height: 1.5rem !important;
+        margin-top: 0 !important;
+        padding-top: 0 !important;
+    }
+    
     /* Reduce spacing between sidebar elements */
     section[data-testid="stSidebar"] .block-container {
         padding-top: 1rem;
@@ -296,7 +308,8 @@ def cancel_editing_system_prompt():
 # Sidebar for model selection and conversation management
 with st.sidebar:
     # Compact model selection at the top
-    st.subheader("Model Selection")
+    # Use markdown instead of subheader to reduce spacing
+st.markdown("### Model Selection")
     
     # Model selection dropdown
     selected_model = st.selectbox(