Change CSS Font Navigation Bar

Site URL: https://ashandelmdesign.com

Hi there, 

I'm trying to change the font for the navigation menu & the hamburger menu on this site: 

https://www.ashandelmdesign.com/ 

Also need to know how to change the font for buttons on forms and in the header..

Add to Home > Design > Custom CSS

.header-actions .btn {
    font-family: yourfont;
}
.header-nav *, nav.header-menu-nav-list * {
    font-family: yourfont;
}