Thread:KockaAdmiralac/@comment-31660698-20190705002532/@comment-27345308-20190705191625

I'm not seeing the slider script imported anywhere from your Common.js or ImportJS, nor am I finding it in any of the script pages on your MediaWiki namespace. Do you know whether any scripts have been deleted from the wiki in the meantime?

As for the colors, check Portalskin, GreekPortal and similar templates, they contain a  statement that returns a hexadecimal color code based on the color that's inserted in the template parameters, so you can add new colors in these places.