How to set ly as display manager?

Repo: https://github.com/fairyglade/ly

Installation:

yay -S ly

Enabling service

systemctl enable ly.service

How to add cmatrix animation during login?

In file: /etc/ly/config.ini set

animation = matrix

And install cmatrix:

yay -S cmatrix-git

Git version of cmatrix is required for transparent background.