Menu item titles

Hello.
I would like to know if there is some way to enlarge the font size of the menu items on the navigation bar.
My web is: http://www.encualquierviaje.com/
Thank you very much…

Hi there,

Try this please:

#mainnav ul li.current-menu-item {
    font-size: 14px;
}

Regards,
Awan