Additional CSS rules can be entered here and will apply to all pages, or the CSS ID of a page can be used to limit the scope of the rule (check the HTML source of the particular page to find its body ID tag.)
On this #tikiexpresstutorial, using #tiki19 I’ll show you:
How to enable a feature from the Control Panels
How to enable a Global Feature from the features panel
How to enable an Interface feature
A quick overview of the Programmer features
And where to look for feature options