Ever figured it out? https://www.mediawiki.org/wiki/Help_talk:Images
Libattery
Joined 12 May 2016
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div.thumb { float:none !important;}
div.thumbinner { margin: 0px auto !important;}
to mediawiki:Common.css
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div.thumb { float:none !important;}
div.thumbinner { margin: 0px auto !important;}
to mediawiki:Common.css