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In the standard skin the main css is following:
/*/*/ /*<![CDATA[*/
@import "/skins/common/wikistandard.css";
@import
"/w/index.php?title=K%C3%A4ytt%C3%A4j%C3%A4:Nikerabbit/standard.css&action=raw&ctype=text/css";
@import "/w/index.php?title=MediaWiki:Standard.css&action=raw&ctype=text/css";
a { text-decoration: none; }
a.new, #quickbar a.new { color: #CC2200; }
#quickbar { position: absolute; top: 4px; left: 4px; border-right: 1px solid gray; }
#article { margin-left: 152px; margin-right: 4px; }

/*]]>*/ /* */
</style>

in cologneblue it is
<style type='text/css'>
/*/*/ /*<![CDATA[*/
@import "/skins/common/cologneblue.css";
@import
"/w/index.php?title=K%C3%A4ytt%C3%A4j%C3%A4:Nikerabbit/cologneblue.css&action=raw&ctype=text/css";
#quickbar { position: absolute; left: 4px; }
#article { margin-left: 148px; margin-right: 4px; }
@import "/w/index.php?title=MediaWiki:Cologneblue.css&action=raw&ctype=text/css";
a { text-decoration: none; }
a.new, #quickbar a.new { color: #CC2200; }

/*]]>*/ /* */
</style>

Notice the position of last @import rule in the cologneblue.
The CSS spec says: Any @import rules must precede all rule sets in a style sheet.
Fix needed to make some changes in fiwiki possible.