themes-wordpress/beep/style.css

/*
Theme Name: Beep
Theme URI: https://wordpress.com/theme/beep
Author: Automattic
Author URI: https://automattic.com/
Description: Inspired by the phrase “code is poetry”, this is a geeky theme designed for those who appreciate the beauty of code. It is a text-heavy theme with a dark palette that plays with the idea of emulating a terminal prompt or code editor.
Requires at least: 6.0
Tested up to: 6.4
Requires PHP: 5.7
Version: 1.0.2
License: GNU General Public License v2 or later
License URI: http://www.gnu.org/licenses/gpl-2.0.html
Text Domain: beep
Tags: blog, one-column, wide-blocks, block-styles, full-site-editing, rtl-language-support, style-variations, threaded-comments, translation-ready
*/

/*
 * 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--white);
}