Script

// Register Script
function custom_scripts() {

	wp_register_script( 'respond', '//cdnjs.cloudflare.com/ajax/libs/respond.js/1.4.2/respond.min.js', false, false, false );
	wp_enqueue_script( 'respond' );

}

// Hook into the 'wp_enqueue_scripts' action
add_action( 'wp_enqueue_scripts', 'custom_scripts' );