MediaWiki skinning

MediaWiki can have almost any look you want, because its look is determined by a "skin" that consists mainly of CSS stylesheets.

For instance, on chekmate.org we found this trick:

#p-nav,#p-search,#p-tb,#footer {
  opacity:0.83;
}
/* make a few corners round, only supported by moz/firefox/other gecko
browsers for now */
#p-cactions ul li, #p-cactions ul li a {  
  -moz-border-radius-topleft: 0.4em;
  -moz-border-radius-topright: 0.4em;
}
#content { 
  -moz-border-radius-topleft: 0.6em; 
  -moz-border-radius-bottomleft: 0.6em;
}
div.pBody {
  -moz-border-radius-topright: 0.4em;
  -moz-border-radius-bottomright: 0.4em;
}