You can customise the appearance of the JADAPTIVE server, these options can be found by navigating to Administration->Branding.
The Images tab allows customisation of the Logo displayed in the top left of the page, the Favicon used in the browser tab. The Icon Set that is used can also be changed.
In the Stylesheet tab you an change the default theme that the UI uses, you can completely disable the ability for users to change the theme, and you can set any Custom CSS that you wish to use.
In the image below you can see a system where we have changed the Logo, favicon and the default theme.