lex-scotland-theme/functions.php

<?php

add_action('init', 'custom_stylesheet');
 
function custom_stylesheet() {
    wp_register_style( 'custom-styles', get_template_directory_uri() . '/style.css' );
    wp_enqueue_style( 'custom-styles' );
}

add_action( 'wp_enqueue_scripts', 'custom_stylesheet' );

add_action( 'init', 'lex_scotland_block_styles');

function lex_scotland_block_styles() {
	register_block_style( 'core/button', array(
		'name'         => 'thin',
		'label'        => __( 'Thin', 'lex-scotland' ),
        'inline_style' => '
            .wp-block-button.is-style-thin .wp-element-button {
                padding: 8px 16px;
                background: var(--wp--preset--color--light-green);
                color: var(--wp--preset--color--contrast);
                border-radius: 0;
                font-size: var(--wp--preset--font-size--small);
            }
        '
    ) );
}