Customizing elements

Of course, you can keep on customizing elements further if you want.

But, before that, familiarize yourself better with UIkit.

Folder assets/app/custom/elements/ contains files with all UI elements. Almost every file contains some code examples that will help you get a grasp of what is happening in there, and how to customize per your needs.

To do it properly, you should also open UIkit source files in parallel assets/app/src/less/components/ to see exactly what are you overwriting.