grub: background_color

 
 16.3.4 background_color
 -----------------------
 
  -- Command: background_color color
      Set background color for active terminal.  For valid color
      specifications see ⇒Colors Theme file format.  Background
      color can be changed only when using 'gfxterm' for terminal output.
 
      This command sets color of empty areas without text.  Text
      background color is controlled by environment variables
      COLOR_NORMAL, COLOR_HIGHLIGHT, MENU_COLOR_NORMAL,
      MENU_COLOR_HIGHLIGHT.  ⇒Special environment variables.