Change font of The Navbar

Hi! I have bought the following theme design: https://demo.ourtuts.com/haze/ and i’d like to change the font in the Navigation Bar now.

I’m getting stuck and can’t find the specific file in the CSS.
If I change the general font, it changes the whole font of the site.

Heres the CSS code from the navbar:

Line 35 - 61

}
ul#mainnav li a {
	color:#323232;
}
ul#mainnav li a:active, ul#mainnav li a:hover , ul#mainnav li.current-menu-item  a{
	background:#bffbff;
	color:#000;
}
ul#features-menu li a:active, ul#features-menu li a:hover, ul#features-menu li.current-menu-item a {
	color:#bffbff;
}
ul#mainnav li ul li a {
	border-top:1px solid #000;
}

ul#mainnav li ul li a:hover {
	background:#000;
}

ul#mainnav li ul li {
	background:#fff;
	margin:0;
}

ul#mainnav li.sfHover a {
	background:#323232;
	color:#fff;
}

PLEASE, i am very desperate… do you have any suggestions?

Thanks in advance!