This is a GDM Login screen with a 50% transparent black bar acoss the top and bottom of the screen.
The Standard welcome text is displayed on the top black bar while the system name and current date is displayed on the bottom black bar.
The login text prompt and buttons reside in the center of the screen on a 50% transparent rectangle.
This theme is compatible with many background images.
In order to change backgrounds just replace the background.png with the png file of your choice and size.
For other backgrounds the text colors may need to be adjusted to be visible.

The background used is rafaellaguna's Orange Dark.