A skin is a collection of CSS properties that can alter the look of the output by changing colors, font types, borders, margins, and paddings. This allows you to rapidly adapt the look and feel of the output for your organization.
Oxygen XML Editor provides a set of predefined skins for the DITA Map WebHelp and DITA Map WebHelp with Feedback transformation scenarios.
The predefined skins cover a wide range of chromatic themes, ranging from a very light one to a high-contrast variant. By default, the Oxygen skin is selected (notice the light blue border around the skin preview). If you want to obtain an output without any customization, deselect the currently selected skin.