Update app.py

app.py

@@ -26,7 +26,7 @@ with upload_column:
             }
             """,
     ):
-        st.button("",  key='upload')
+        st.button(" ",  key='upload')
 
 with delete_column:
     with stylable_container(
@@ -42,7 +42,7 @@ with delete_column:
             }
             """,
     ):
-        st.button("",  key='delete')
+        st.button(" ",  key='delete')
 
 with browse_column:
     with stylable_container(
@@ -58,7 +58,7 @@ with browse_column:
             }
             """,
     ):
-        st.button("",  key='view')
+        st.button(" ",  key='view')
 
 with recycle_column:
     with stylable_container(
@@ -74,7 +74,7 @@ with recycle_column:
             }
             """,
     ):
-        st.button("",  key='recycle')
+        st.button(" ",  key='recycle')