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From Hobbs Knowledge Base

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/** CSS placed here will be applied to all skins */

h2 {margin-top:1.5em}
#bodyContent a.extiw[href *=".wikipedia.org"],
#bodyContent a.external[href *=".wikipedia.org"]{
   background: url(/w/images/2/20/Wikipedia-icon.png) top right no-repeat;
       padding-right: 16px;
}