It is possible to add custom html to the login screen, as seen on the public testing site. For example, to show news or other important information to your users, before they log into the system.

To do this:

 Create a file called login.html, located in custom/html/login.html.
 Add necessary html to it, then save the file.

For example, here is the contents of the login.html file on our public testing site:

Here is a preview of the result:

Preview of a customized login screen