A simplistic clean and minimal theme for rEFInd

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Clone git repository to your $HOME directory.
git clone https://github.com/munlik/refind-theme-regular.git -
Locate refind directory under EFI partition. For most Linux based system is commonly
/boot/efi/EFI/refind/. Copy theme directory to it.Important: Delete older installed versions of this theme before you proceed any further.
sudo rm -rf /boot/efi/EFI/refind/{regular-theme,refind-theme-regular}sudo cp -r refind-theme-regular /boot/efi/EFI/refind/ -
Remove unused directory.
sudo rm -rf /boot/efi/EFI/refind/refind-theme-regular/{src,.git} -
To adjust icon size and font size edit
theme.conf.sudo nano /boot/efi/EFI/refind/refind-theme-regular/theme.conf -
To enable the theme add
include refind-theme-regular/theme.confat the end ofrefind.conf.sudo nano /boot/efi/EFI/refind/refind.conf
More information
rEFInd An official rEFInd website