The two bottom modules titled Popular items and Latest news.
This content is rendered using the default settings for the mostread and latest news modules that come with Joomla 3+.
The background colour used for this row is one of the row styles that can be assigned by row via the template settings. See below for more details.
Popular items This module is published to the bottom1 position.
Latest News This module is published to the bottom6 position.
The background colour used for this row is determined by the template and can be found in the theme panel in the template administrator.
The row style is applied to a row of modules grouped by their respective rows.
Row Styles in the template settings