What's wrong with Joomla layout?

Question

Joomla

For the sake of Christ, tell me why all the sub-items of the vertical menu are cut off by a div.
www.windows-service.kz/index.php/ru

Answer 1

And in more detail where it cuts off, I did not see anything like that. Screenshot preferred.

Answer 2

Offtopic:
In the name of the great Cthulhu and the spaghetti monster, say that this is just a sketch of something about something, and not the final result (final version) of the site about windows....