Hi there,
Please add this in the functions.php file of your child theme:
/**
* Enqueue scripts and styles.
*/
add_action( 'wp_enqueue_scripts', 'load_scripts' );
function load_scripts() {
wp_enqueue_style( 'fns-google-font', 'https://fonts.googleapis.com/css?family=Oswald:200,300,400,500,600,700' );
}
Then you can use CSS in the customizer to set the font weight of an element. Example:
h1 {
font-weight: 200;
}
Hope this helps.