not loadded css

I added code in functions.php. But css not loadded.

function theme_name_scripts() {
   wp_register_style( 'animatestyle', get_stylesheet_directory_uri() . '/css/style_blog.css'  );
	wp_enqueue_style( 'animatestyle' );
}
add_action( 'wp_enqueue_scripts', 'theme_name_scripts' );

thanks for the help