The main content region of a page consists of different content regions. The number of regions and their layout is defined by the Page Layout.
Each of the regions can be styled individually. There are 5 different styles
(see examples below)
Note: the style may not be visible until the page is saved
After choosing the Background Box style and clicking next, select the version of the background box style. The 5 background box colors are defined by the site’s color palette.
The image below illustrates the non-default styles for regions.