Register a rounded card with shadow block style

rounded_card_block_style.php

<?php
/**
 * Register a rounded card with shadow block style
 */
$rounded_card_block_types = array( 'core/group', 'core/columns' );
foreach ( $rounded_card_block_types as $rounded_card_block_type ) {
	register_block_style(
		$rounded_card_block_type,
		array(
			'name' => 'rounded-card-box',
			'label' => __( 'Rounded Card', 'pmpro' ),
		)
	);
}