If you use LightDM the display manger then you will it don't look great by default setting. You can make it look beautiful by GUI or by going into config file and editing it. Editing config file is hard for most users, mostly who are new in Linux. The Simplest way is use GUI interface to customize the LightDM.
So as you can read the title the simple way to customize the LightDM. For simple way we are going to use GUI interface to customize the LightDM.
LightDM- The display manger.
sudo apt install lightdm
LightDM Greeter- The editing package.
sudo apt install lightdm-gtk-greeter-settings
And finally select save. Now log out and see your awesome lock screen.
The thing is you can make it more awesome by editing config files. But most people don't want to go that much deep so GUI interface is best for most people.
It's social media for devs
Level up every day