Background Color Drag & Drop
From SAP Enable Now Wiki
Scope
Purpose
This property is used to define the 'fill' color for question controls (the objects to be reordered) for a Sorting type question, when the Interaction is set to Drag & Drop.
Use
You can either click on the colored square to the left of the property field (which shows the current color) and select or specify the required color in the Color Chooser dialog box, or you can enter the RGB hexadecimal color code directly into the property field. Alternatively, you can click on the checkered square on the left of the property field to set the background color to transparent.