install
cd /usr/share/lightdm-webkit/themes
sudo git clone https://github.com/swwind/lightdm-theme-gradient gradient
sudo vim /etc/lightdm/lightdm-webkit2-greeter.conf
# webkit_theme = gradient
dev
git clone https://github.com/swwind/lightdm-theme-gradient.git
cd lightdm-theme-gradient
./install.sh
sudo vim /etc/lightdm/lightdm-webkit2-greeter.conf
# webkit_theme = gradient