Update app.py

app.py

@@ -8,7 +8,7 @@ st.markdown(
 )
 
 with stylable_container(
-    key="container_with_border",
+    key="upload_button",
     css_styles=r"""
         button p:before {
             font-family: 'Font Awesome 5 Free';
@@ -23,7 +23,7 @@ with stylable_container(
     st.button("Upload File")
 
 with stylable_container(
-    key="container_with_border",
+    key="delete_button",
     css_styles=r"""
         button p:before {
             font-family: 'Font Awesome 5 Free';