CILogon and COmanage support custom themes via their own individual CSS files. uses CSS Bootstrap 4.x ( under the hood. The CSS for CILogon “skins” is stored in the database and output to a <style> block in the <head> of the HTML. 

Some examples include:


When creating CSS, make sure it also works with as there are HTML elements on that page not shown on


Share the CSS with the CILogon team via a GitHub repo.

The service supports loading images and other resources via URLs or they can be hosted by the service.