title: How to define a custom RGB background colour in VIM?
body: <p>Is it possible to define a custom RGB colour for the background colour of VIM?</p>
  
  <p>At the moment I use <code>set background=dark</code> in my <code>.vimrc</code> which assigns <code>#5D5D5D</code> for the background colour. However, I would prefer to have <code>#3F3F3F</code> for my background colour.</p>