How do I remove the default GRUB background?

I just want to set the default GRUB background black like normal. I don't want to install any GRUB themes.

I tried removing desktop-base but GNOME depends on it.

I tried checking if the theme was applied from /etc/default/grub and there wasn't anything.

I checked the files in /etc/grub.d but couldn't figure out how to configure 05_debian_theme.