I've been using dotfiles created by other people to setup Vim. Recently I decided to create my own config and investigate what's NeoVim about. I'm using default OSX Terminal.app with zsh shell (I've installed oh-my-zsh). I can't figure out which colors does Vim use and why they differ from NeoVim. The only thing I've set so far is line number color (line 12 on screenshot).
How could I specify which colors for Vim to use? How to develop custom color scheme for Vim?
NeoVim is on the left pane on the screenshot below.