Thank you for your answer!
Sorry, but your response has not been recieved perfectly, so I only saw in a half-line in the whole message, therefore asked to again. I don’t know what happened… Excuse me!
I’m using Widgetkit, like on the demo site, and everything what you adviced in videos and tutorials.
Yesterday evening, when I wrote to you, I didn’t see the changes (boxed medium appearance) on my site, perhaps the older version was stored in the browser, although I updated the site more, than once…
But, today morning everything is ok, because my site’s appearance is in the boxed medium layout.