Cartzilla - Add custom Google Font

functions.php

if( ! function_exists( 'cz_child_custom_google_font_families_roboto' ) ) {
    function cz_child_custom_google_font_families_roboto( $fonts ) {
        $fonts['roboto'] = 'Roboto:100,300,400,500,700,900';
        return $fonts;
    }
}

add_filter( 'cartzilla_google_font_families', 'cz_child_custom_google_font_families_roboto', 20 );

style.css

body,
.tooltip,
.popover,
.a2a_count,
.a2a_full_services .a2a_i,
.a2a_menu a,
.single-post .sharedaddy .sd-social-icon-text .share-btn span {
    font-family: 'Roboto', sans-serif;
}