To change the look of friendica you have to touch the themes.
The current default theme is [Vier](https://github.com/friendica/friendica/tree/stable/view/theme/vier) but there are numerous others.
-Have a look at [friendica-themes.com](http://friendica-themes.com) for an overview of the existing themes.
+Have a look at [github.com/bkil/friendica-themes](https://github.com/bkil/friendica-themes) for an overview of the existing themes.
In case none of them suits your needs, there are several ways to change a theme.
So, how to work on the UI of friendica.