Update CSS selector in app.py to improve layout consistency

Modified the CSS selector for box-sizing to enhance layout rendering across different elements. This change aims to ensure a more uniform appearance and improve the overall user experience.

app.py

@@ -61,7 +61,7 @@ st.markdown("""
         color: white;
     }
 
-    .stVerticalBlock.st-emotion-cache-6kio1c.eu6p4el3 {
+    div[style*="box-sizing"] {
         box-sizing: content-box !important;
     }