Test on any device on 3.3 site.
In web, create a database activity and add some entries.
Set the CSS template to:
table {
color: green;
}
In the app, go to the database activity.
Check that the list of entries is displayed in green text.
View an entry individually and check the text is green.
Edit an entry and check the text is green.
In web, set the CSS template to blank.
In the app, check that database entries are displayed without errors and the text is black.