themes-wordpress/perenne/style.css

/*
Theme Name: Perenne
Theme URI: https://wordpress.com/theme/perenne
Author: Automattic
Author URI: https://automattic.com/
Description: Exegi monumentum aere perennius.
Requires at least: 6.0
Tested up to: 6.4
Requires PHP: 5.7
Version: 1.0.1
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: perenne
Tags: blog, one-column, featured-images, full-site-editing, rtl-language-support, threaded-comments, translation-ready, wide-blocks, style-variations
*/

/*
 * Control the hover stylings of outline block style.
 * Unnecessary once block styles are configurable via theme.json
 * https://github.com/WordPress/gutenberg/issues/42794
 */
.wp-block-button.is-style-outline > .wp-block-button__link:not(.has-background):hover {
	background-color: var(--wp--preset--color--primary);
	border-color: var(--wp--preset--color--primary);
	color: var(--wp--preset--color--base);
}

/*
 * Link styles
 * https://github.com/WordPress/gutenberg/issues/42319
 */
a {
	text-decoration-thickness: 0.0625em !important;
	text-underline-offset: 0.15em;
}