Enhance tab styling with border and rounded corners

Improved tab design by adding border radius and a subtle border to selected tabs, creating a more polished and visually appealing user interface.

app.py

@@ -48,6 +48,8 @@ st.markdown("""
 
     .stTabs [aria-selected="true"] {
         background-color: #DAA520;
+        border-radius: 10px;
+        border: 1px solid #FFD700;
         color: white;
     }