MediaWiki:Common.css

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/* CSS placed here will be applied to all skins */
.toc .toctitle {
    counter-reset: h2counter;
}

body {
    counter-reset: h2counter;
}

div.mw-parser-output h2:before {
        content: counter(h2counter) ".\0000a0\0000a0";
        counter-increment: h2counter;
        counter-reset: h3counter;
    }

div.toctitle h2:before !important {
 content: "";
 counter-reset: h2counter;
 counter-reset: h3counter;
}