/usr/share/plymouth/themes/breeze/breeze.grub is in plymouth-theme-breeze 5.12.4-0ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 | #set_background_image "images/tile.png";
set menu_color_normal=blue/black
set menu_color_highlight=red/light-gray
if background_color 1,1,1; then
clear
fi
|