You are able to add content to the login screen. This is helpful for promotions, notices and other information.
There are two types of login screen content available. One is for a desktop browser and the other for smartphone (small) browsers.
1. Desktop and tablet login content
Content for large browsers are show on the right of the login form (username and password). It is configured in System settings by adding an HTML source to the Login Content parameter under Login screen and Mobile App section. The content is created in the HTML source document under System settings --> Styles & HTML.
2. Mobile App / smartphone login content
Keep in mind that using this functionality its possible to add an entire infrastructure to the landing page of your Mobile App. Common things to add are menus, content, brochures, information, effects, etc.