How to > Advanced features and topics > Settings > The 2D viewport color menu
  
The 2D viewport color menu
Use the Viewport section of the Default Settings dialog box to specify the colors used in the 2D viewport. To access the dialog box, right-click the 2D viewport and select Viewport Settings in the shortcut menu.
The following options are available:
Choose the Background Color for the viewport.
Click Invert Elements if you wish the drawing elements to appear in a different color from the background.
Under Highlight, you may change the Color and Line Type used for highlighting elements.