The System Section contains Stylesheet rules defined for all sites made with Second Site. There are many sub-sections, and each defines a style that affects one or more HTML elements. It can be daunting at first, and I recommend that new users avoid these settings until they are comfortable with how Second Site works. There's no danger in modifying property values in this section, but many of the properties derive their value from properties in the Stylesheets.Theme sections and it's usually better to make changes there.
Some values use a reference notation for style values. See Reference Values for an explanation of values that start with "theme:" and similar notations.
This page last changed on 05 Feb 2016.