Update app.py

app.py

@@ -544,10 +544,10 @@ def main():
     # Step 3: Configure Atom Selections in Main Area
     st.markdown("---")
     st.subheader("🔬 Configure Atom Selections")
-    st.info(f"""ℹ️ **Atom Selection:** Backbone + Sugar
-    - For purines (A, G): N9, C8, C4
-    - For pyrimidines (C, U): N1, C2, C6
-    - For backbone and sugar atoms: "P", "OP1", "OP2", "O5'", "C5'", "C4'", "O4'", "C3'", "O3'", "C2'", "O2'", "C1'"
+    st.info(f"""ℹ️ **Atom Selection:** Backbone + Sugar\n
+    - For purines (A, G): N9, C8, C4\n
+    - For pyrimidines (C, U): N1, C2, C6\n
+    - For backbone and sugar atoms: "P", "OP1", "OP2", "O5'", "C5'", "C4'", "O4'", "C3'", "O3'", "C2'", "O2'", "C1'"\n
     """)