Enqueue Google Fonts in Theme

/* 
 * Enqueue Google fonts 
 * Replace font link as needed for different fonts.
 * Get the fonts link from Google after adding font family (or families)
 * and selecting the font weights and styles.
*/
add_action( 'wp_enqueue_scripts', 'prefix_scripts_styles' );

function prefix_scripts_styles() {
	wp_enqueue_style( 'google-fonts', '//fonts.googleapis.com/css?family=Open+Sans:400,400i,600,600i,700,700i|Roboto:400,400i,500,500i,700,700i', array(), '1.3.1' );
}