The official Grub theme for CuerdOS, based on the Xenlism Grub Theme [https://github.com/xenlism/Grub-themes] The reason for this fork has been to build on an already well-built theme to modify it so that it has the visual identity of CuerdOS.
(for debian based distros)
sudo nano /etc/default/grub
Once inside the file, you must change the following value:
GRUB_CMDLINE_LINUX_DEFAULT="quiet splash"
And paste this at the bottom (don't forget to leave the last line empty):
GRUB_THEME="/boot/grub/themes/cuerdos-grub/theme.txt"
And finally update the Grub configuration:
sudo update-grub