02-28-2016 09:24 AM
while the themes are ruled/modified by the SASThemes and SASThemesForFlex, the login pages are "independent" as part of the SASLogon application in SAS 9.4.
This is a style mixed with a JSP page (html with java) in the SASServer1_1, but you can find it more easily with the Web Tools of Chrome or a web developer tool as FireBug for firefox.
This is not documented (which means, be carefull), and not sure if it is supported by SAS.
02-28-2016 09:30 AM
An additional remark:
please keep in mind: any change in the default SAS web applications, could be lost after each SAS platform update or migration.
If you make the changes on the deployed (SASServer1_1/sas_deploy) application, then this can happen on any rebuild/redeploy action too.
To avoid this, you can apply the change directly on the non-deployed web aplication (commonly called Stagging), and then you document your changes and remember to apply them after each update/migration of the SAS Platform.