Body Texture: This option sets a subtle repeating background pattern which can be influenced to varying degrees by the URL's "Background color" setting. 

Content Background Color: This option creates a box around the main content area of the site (separate from the header and footer)and sets it to the selected color.

Body Text Color: This option sets the default color for the main text of the site.

Content Text Color: This option sets the default color for the content text of the site. 

Link Color: This option sets the default link color (including visited and active links).

Accent Color: The Accent color is used differently in each site "design" but usually provides small bursts of color in areas of the site such as navigation and block titles.

Show Asset Type Icons: This property toggles the display of Asset Type Icons. 

Custom CSS Instance: This property allows the site to create custom CSS snippets which will be inserted inline at the end of the HTML page. These snippets can be defined in the site's custom component or in the site's CSS file.

Preview Aspect Ratio: This property sets the aspect ratio of preview images. Block settings take precedent if set.

Related Asset Display: This property determines the display of sibling assets.

Show Time-to-Read Estimate: Determines where the Time-to-Read Estimate will display.

Letterbox Styles: This property sets the background style of letterbox images.