Home page Sidebar width setting error

I want a home page with news. Exactly the same as it is in the example. BUT! The sidebar is too high, more specifically large. Each sidebar is too big.
Where can I set this up?
I tried the layout menu. Failed. I do not understand what could be the problem …
It looks like the page http://wb14.cpserver.net/~m3archeo/

Thank you very much for your help!