Step 1: Add CSS
- Go to Admin > Online Store > Themes
- Click the "Actions" button on the right-hand side, and select "Edit code"
- Find custom.css from the left-hand side file list and open it
- Add following codes at the very end/beginning of the file and save the changes.
#qab_background{ z-index: 1000 !important; }

Enjoy the app
Congratulations. You successfully integrate the app with your theme.