Limit TOC depth on wiki

[wenzeslaus]

I would like to be able limit TOC depth on the GRASS (user) wiki. The documentation says "To customize this for individual pages, the TOC can be enclosed in an element with class toclimit-<limit>, if the appropriate CSS rules are defined in the pages CSS." And suggests the following CSS which I don't see in

​https://grasswiki.osgeo.org/w/load.php?debug=false&lang=en&modules=mediawiki.legacy.commonPrint%2Cshared%7Cmediawiki.page.gallery.styles%7Cmediawiki.sectionAnchor%7Cmediawiki.skinning.interface%7Cskins.vector.styles&only=styles&skin=vector

/*
 * Allow limiting of which header levels are shown in a TOC;
 * <div class="toclimit-3">, for instance, will limit to
 * showing ==headings== and ===headings=== but no further.
 * Used in [[Template:TOC]]
 */
.toclimit-2 .toclevel-1 ul,
.toclimit-3 .toclevel-2 ul,
.toclimit-4 .toclevel-3 ul,
.toclimit-5 .toclevel-4 ul,
.toclimit-6 .toclevel-5 ul,
.toclimit-7 .toclevel-6 ul {
        display: none;
}

​https://www.mediawiki.org/wiki/Manual:Table_of_contents

​https://www.mediawiki.org/wiki/MediaWiki:Gadget-site.css

Wikipedia uses the following template:

<div class="toclimit-{{{1|{{{limit|3}}}}}}">__TOC__</div><noinclude>
{{documentation}}
</noinclude>

​https://en.wikipedia.org/w/index.php?title=Template:TOC_limit&action=edit