themes-wordpress/loudness/functions.php

<?php
/**
 * Loudness functions and definitions
 *
 * @link https://developer.wordpress.org/themes/basics/theme-functions/
 *
 * @package Loudness
 * @since Loudness 1.0
 */


if ( ! function_exists( 'decibel_support' ) ) :

	/**
	 * Sets up theme defaults and registers support for various WordPress features.
	 *
	 * @since Loudness 1.0
	 *
	 * @return void
	 */
	function decibel_support() {

		// Enqueue editor styles.
		add_editor_style( 'style.css' );

	}

endif;

add_action( 'after_setup_theme', 'decibel_support' );

if ( ! function_exists( 'decibel_styles' ) ) :

	/**
	 * Enqueue styles.
	 *
	 * @since Loudness 1.0
	 *
	 * @return void
	 */
	function decibel_styles() {

		// Register theme stylesheet.
		wp_register_style(
			'loudness-style',
			get_stylesheet_directory_uri() . '/style.css',
			array(),
			wp_get_theme()->get( 'Version' )
		);

		// Enqueue theme stylesheet.
		wp_enqueue_style( 'loudness-style' );

	}

endif;

add_action( 'wp_enqueue_scripts', 'decibel_styles' );

function decibel_init() {
	if ( ! WP_Block_Pattern_Categories_Registry::get_instance()->is_registered( 'illustrations' ) ) {
		register_block_pattern_category( 'illustrations', array( 'label' => __( 'Illustrations', 'loudness' ) ) );
	}

	register_block_style(
		'core/navigation-link',
		array(
			'name'  => 'navigation-link-button',
			'label' => __( 'Button', 'loudness' ),
		)
	);
}

add_action( 'init', 'decibel_init' );