grub: background_color
16.3.4 background_color
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-- 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.