Wittstock is a classless theme.
Download ZIP file and copy it into your system/extensions folder. Learn more about extensions.
All theme files are stored in your system/themes folder. All layout files are stored in your system/layouts folder. You can edit these files. Your changes will not be overwritten when the website is updated.
The default theme is defined in file system/extensions/yellow-system.ini. A different theme can be defined in the page settings at the top of each page, for example Theme: wittstock. Learn more about themes.
This extension includes Simple.css by Kev Quirk. Thank you for the good work.
Steffen Schultz. Get help.