Menu hover on one page

Hi, I try to create own wordpress one page theme.

http://fida-stav.startupweb.sk/

Please, look at top menu. First menu li has orange color and orange border.
When you click on menu item, you scroll down to relevant section (page), but orange color with orange border has still first menu li.

css code:
.top-menu li.current_page_item {
border: 1px solid #e07225;
}

I looked for some code withou result. Please any advice? thanks