Molokai is a Vim port of the monokai theme for TextMate originally created by Wimer Hazenberg.
By default, it has a dark gray background based on the version created by Hamish Stuart Macpherson for the E editor.
This version adds support for undercurl and italic attributes in terminal vim.
Assumes vim is compiled with undercurl patch and 24-bit truecolor support in terminal
Copy the file on your .vim/colors folder.
If you prefer the scheme to match the original monokai background color, put this in your .vimrc file:
let g:molokai_original = 1