switched theme to streamlit; added icon on download buttons

stand.py

@@ -39,15 +39,15 @@ with col1:
 
         with col2:
             with open("output.h5", "rb") as f:
-               st.download_button("Download hdf5", f, file_name="output.h5")
+               st.download_button("📥 hdf5", f, file_name="output.h5")
 
         with col3:
             xlsx = to_excel_binary(df)
-            st.download_button("Download xlsx", xlsx, file_name="output.xlsx")
+            st.download_button("📥 xlsx", xlsx, file_name="output.xlsx")
 
         with col4:
             csv = df.to_csv()
-            st.download_button("Download csv", csv, file_name="output.csv")
+            st.download_button("📥 csv", csv, file_name="output.csv")
 
 #        st.stop()
 
@@ -71,6 +71,8 @@ response = AgGrid(
     sortable=True,
     resizable=True,
 
+    theme="streamlit",
+
     fit_columns_on_grid_load=True,
 
     reload_data=changed,