Try to search header (Top) menu code in css. In a browser inspect element and find the appropriate css file. Then find it on your server.
It's easy to do it on your localhost. Try using WAMP server. And learn how to use it. And check out some tutorials. Now when you installed Wamp...
Try to search through wordpress templates try to find galleries(spotlights, slideset, slideshow). And of course joomla. ;)
Hello i'm new here. :)
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