Theme (skin) for ExDialer in the style Material Design - Transparent Red.
It's not a standalone app. Install ExDialer to apply this theme.
The background to this topic is your desktop, so it may be different from that in the image below.

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Installation Instruction:
1. Menu > Preferences > Theme
2. Select the theme

To Set The Theme Properly
Go To:
Preferences > Appearance > Dialpad Size > Height > Set = 1.30x - 1.60x
Preferences > Appearance > Dialpad Size > Width > Set = 0.90x - 1.00x
Preferences > Appearance > Dialpad Text Size > Small or Normal
Preferences > Appearance > untick ABC at Right.