The menu line item is offset aside

Hi. I set a template. I created the menu.
I connected the module to "topmenu" line item.
But the line item of the menu moved down.
Help me to correct it.
Your video instruction too didn't help me.
My site: obzor3d.ru

I corrected a problem. But I think that isn't absolutely correct.
In the "template_css.css" file I added a line:

.mnu_topmenu2 > li {
border-top: none;
top: -16px;
}

In Opera and Explorer browsers the line costs correctly.
- In FireFox it is a little offset. It can be corrected?

You can use:

-moz-transform: translateY(-2px);

to adjust position only for firefox. -2x is example counter offset you should adjust