FreeCAD: How to set background color?

Update: January 7, 2019
FreeCAD 0.17
  1. Select [Edit]-[Preferences...] in menu bar.

  2. In [Display] of Preferences dialog, select [Colors] tab and click colored button at [Background color].

    Preferences_backgroundcolor Preferences dialog
  3. Select any color in Select Color dialog and click OK.

    ColorChooser Select Color dialog
  4. Click Apply in Preferences dialog to apply your settings.

    ChangingBackColor Changes Color
Note: Background color is set to following gradation color in default settings.
  • Upper RGB color : (51, 51, 101)
  • Lower RGB color : (151, 151, 170)