Enqueue Google Font via functions.php

enqueue_google_font_1.php

/////////////////////////
// ENQUEUE GOOGLE FONT //
/////////////////////////

add_action('wp_enqueue_scripts', 'custom_google_fonts');
function keokee_google_fonts() {
    wp_enqueue_style( 'keokee_google_fonts', '//fonts.googleapis.com/css?family=Montserrat:400,700' );
}

enqueue_google_font_2.php

//////////////////////////
// ENQUEUE GOOGLE FONTS //
//////////////////////////

function google_fonts() {
	$query_args = array(
		'family' => 'Open+Sans:400,700|Oswald:700'
		'subset' => 'latin,latin-ext'
	);
	wp_register_style( 'google_fonts', add_query_arg( $query_args, "//fonts.googleapis.com/css" ), array(), null );
	}
            
add_action('wp_enqueue_scripts', 'google_fonts');