CSS Styles for a terminal emulator (ie, the window you have in Linux or OSX that presents a UNIX command line interface). It can also do line numbering in a way that looks like a popular vim theme. It does this all through advanced :after and :before trickery!
<pre class="terminal-emulator"> or
<div class="terminal-emulator"> to
use. For the line numbering, add the vim class, like
Vaguely modeled off of GNOME 3's styling. Should work with or without Bootstrap.