This is a LightDM webkit greeter theme for Archlinux. Based on LightDM-Webkit-MacOSX-Theme
You will need lightdm as your login manager and the lightdm-webkit-greeter from AUR. You need to make the webkit greeter the default greeter. This is done by editing the lightdm configuration under:
/etc/lightdm/lightdm.conf
and changing the greeter-session value to lightdm-webkit-greeter. lightdm.conf should have:
[SeatDefaults] greeter-session=lightdm-webkit-greeter allow-guest=false
The second step is to install the actual theme. This is done by copying the files of this repository into the following location:
/usr/share/lightdm-webkit/themes/arch
Finally, change the /etc/lightdm/lightdm-webkit-greeter.conf file to contain the following line:
webkit-theme=arch
Now you can reboot and enjoy the new theme.