Version 2.14+ will check for and include custom.css in /css. Custom CSS should be placed in this file, and is not overwritten during an upgrade.
These files are key to customizing the look of the panel and can be edited with the 'Edit Header/Footer' admin tool in the admin menu.
- App_Data/Menu.inc: The menu template for the panel. Not overwritten during upgrade.
- The header.inc file is HTML and is shown above the login boxes on the login screen. Overwritten during upgrades.
- The footer.inc file is an HTML file that provides the HTML for the footer. Overwritten during upgrades.
- The login.txt file will display it's HTML contents below the login box on the login page. Not overwritten during an upgrade.