I took this from https://github.com/openstyles/stylus/wiki/UserCSS-authors
/* ==UserStyle==
@name Example UserCSS style1
@description I took this from https://github.com/openstyles/stylus/wiki/UserCSS-authors
@namespace github.com/openstyles/stylus
@version 1.0.0
@license unlicense
==/UserStyle== */
@-moz-document domain("example.com") {
a {
color: red;
}
}