After scrolling down the page menu is distorted

After scrolling down the page menu is distorted. The button "login" shrinks and goes up. lost line under menu.

On the first photo before scrolling.
In the second photo, after you scroll down the page.

Please help.

http://www.labytnangi.net/obyavleniya

this happens after scrolling down the page

solved, override.css.

Code: Select all

#gkLogin {
height: 40px!important;
line-height: 41px!important;
} 

Hi

Thank You for sharing. I'll inform programmers about it.