The site http://www.wikimedia.org.es/ is just a MediaWiki install with a custom skin. The main page blocks (Actividades, Participa, Dona, Blog and the slideshow) are achieved with a tag which outputs the needed html.
However, there is a bug in the css, which relies on some element of the custom skin for proper placement. Compare http://www.wikimedia.org.es/wiki/Portada?useskin=wmes (Good: Actividades, Participa & Dona at the left) with http://www.wikimedia.org.es/wiki/Portada?useskin=vector (Wrong: Actividades, Participa & Dona appear on top of the slideshow).
Figure out the wrong rules and provide a patch for fixing the issue, so it works on any skin. Both the html (the php file) and the css can be changed.
Since this extension is not in gerrit, the patch shall be provided on this bug.
Version: unspecified
Severity: normal
Whiteboard: gci2013
URL: http://www.google-melange.com/gci/task/view/google/gci2013/6649325425786880