Aurora is a set of modern, minimalist Grub bootloader themes in four color variants: Red, Purple, Blue and Green.
The easiest way to install these themes is using the Grub Customizer GUI app.
$ sudo pacman -S grub-customizer
$ sudo add-apt-repository ppa:trebelnik-stefina/grub-customizer
$ sudo apt update
$ sudo apt install grub-customizer
$ sudo dnf install grub-customizer
Enter your password and open the Appearance Settings tab.
From here, select the 'Theme' input box and select the Aurora archive. Then hit save and reboot.