Editing Footer to remove theme name/author

Hello, I am using the free version and based on the past topics (contributed by Mahesh) I added the following in custom CSS but it did not work to remove the theme name and author from the footer (Gridalicious by Catch Theme) #site-details .theme-name, #site-details .theme-author { display: none; } Please advise. Thanks www.mindscienceyoga.org