This is red dark theme, that gives you magic powers at coding. Try it and grow. You're welcome to contribute, also you can change the red color for another one, it's fully customizable.
For install this theme and anothers you must create an folder at ~/.config/rofi, so in that folder rofi/ you'll put all themes that you want, in this case the .rasi file located at theme/erebus.rasi. After that you're ready to create config.rasi file at ~/.config/rofi, this it's an "leader" file and inside just put @theme "erebus", and that's all.
If you like, could do all of the above by one command line, linux cheers.
mkdir ~/.config/rofi && touch ~/.config/rofi/config.rofi; echo '@theme "erebus"' >> ~/.config/rofi/config.rasi; git clone https://github.com/kadaxi/rofi-erebus-theme.git; mv rofi-erebus-theme/theme/erebus.rasi ~/.config/rofi/.