WordPress Mixed Content Error (google font related)

I’ve searched the forums, but I cannot figure out exactly how to fix the mixed content error on my site to make it https.

Here is the error from chrome:

Mixed Content: The page at https://www.example.com/ was loaded over HTTPS, but requested an insecure stylesheet http://fonts.googleapis.com/css?family=Oswald:300,400,700. This request has been blocked; the content must be served over HTTPS.

I am a complete noob, and don’t know where/what to change.

Please provide noob direction, thanks in advance, a resolution will allow me to launch….thanks so much!

—updated—-

It didn’t work (probably because of me). This is where it is in the code in the functions.php file but it didn’t work (i changed the http to https on the is ssl function)

$open_sans = _x( 'on', 'Open Sans font: on or off', 'Divi' );

    if ( 'off' !== $open_sans ) {
        $font_families = array();

        if ( 'off' !== $open_sans )
            $font_families[] = 'Open+Sans:300italic,400italic,600italic,700italic,800italic,400,300,600,700,800';

        $protocol = is_ssl() ? 'https' : 'http';
        $query_args = array(
            'family' => implode( '%7C', $font_families ),
            'subset' => 'latin,latin-ext',
        );
        $fonts_url = add_query_arg( $query_args, "$protocol://fonts.googleapis.com/css" );
    }

    return $fonts_url;
}
endif;