Disable GitHub syntax highlighting using Stylish

gistfile1.css

@namespace url(http://www.w3.org/1999/xhtml);

@-moz-document url-prefix("https://github.com/") {

.pl-c{
  color: #222 !important;
}

.pl-c1,.pl-mdh,.pl-mm,.pl-mp,.pl-mr,.pl-s1 .pl-v,.pl-s3,.pl-sc,.pl-sv{
  color: #222 !important;
}

.pl-e,.pl-en{
  color: #222 !important;
}

.pl-s1 .pl-s2,.pl-smi,.pl-smp,.pl-stj,.pl-vo,.pl-vpf{
  color: #222 !important;
}

.pl-ent{
  color: #222 !important;
}

.pl-k,.pl-s,.pl-st{
  color: #222 !important;
}

.pl-pds,.pl-s1,.pl-s1 .pl-pse .pl-s2,.pl-sr,.pl-sr .pl-cce,.pl-sr .pl-sra,.pl-sr .pl-sre,.pl-src{
  color: #222 !important;
}

.pl-mo,.pl-v{
  color: #222 !important;
}

.pl-id{
  color: #222 !important;
}

.pl-ii{
  color: #222 !important;
}

.pl-sr .pl-cce{
  color: #222 !important;
}

.pl-ml{
  color: #222 !important;
}

.pl-mh,.pl-mh .pl-en,.pl-ms{
  color: #222 !important;
}

.pl-mq{
  color: #222 !important;
}

.pl-mi{
  color: #222 !important;
}

.pl-mb{
  color: #222 !important;
}

.pl-md,.pl-mdhf{
  color: #222 !important;
}

.pl-mdht,.pl-mi1{
  color: #222 !important;
}

.pl-mdr{
  color: #222 !important;
}

}

Motivation.

It's tempting to give pl-c a color for comments. But then you encounter (say) a Lisp file with a ?\; char literal that's mix-lexed and... yeah no. Ditto for strings.