obs-studio/docs/sphinx/_static/css/custom.css

/* Override "references as links" style to match standard links.
   Example code: :c:func:`OBS_DECLARE_MODULE()` */
a.reference > code.xref > span.pre {
    color: #2980b9;
}

a.reference:hover > code.xref > span.pre {
    color: #3091d1;
}

a.reference:visited > code.xref > span.pre {
    color: #9b59b6;
}