Linux Grub simple dark theme

Simple dark GRUB theme. I like Poly dark and install it:
Supported languages: Chinese (simplified), English, French, German, Norwegian, Portuguese, Russian, Spanish, Ukrainian
Simple dark theme
Installation / update:
1. Secure way:
⋅ Download install script:

wget -P /tmp https://github.com/shvchk/poly-dark/raw/master/install.sh

⋅ Review install script at /tmp/install.sh
⋅ Run it:

bash /tmp/install.sh

2. Easier, less secure way — just download and run install script:

wget -O - https://github.com/shvchk/poly-dark/raw/master/install.sh | bash

 
 
If you need simple light theme (poly-light), just download and run install script:

wget -O - https://github.com/shvchk/poly-light/raw/master/install.sh | bash