themes-wordpress/pixel/style.css

/*
Theme Name: Pixel
Theme URI: https://github.com/Automattic/themes/tree/trunk/pixel
Author: Automattic
Author URI: https://automattic.com/
Description: Pixel is a Tumblr Inspired Theme
Requires at least: 5.8
Tested up to: 5.9
Requires PHP: 5.7
Version: 0.0.5
License: GNU General Public License v2 or later
License URI: https://raw.githubusercontent.com/Automattic/themes/trunk/LICENSE
Template:
Text Domain: pixel
Tags: one-column, custom-colors, custom-menu, custom-logo, editor-style, featured-images, full-site-editing, rtl-language-support, theme-options, threaded-comments, translation-ready, wide-blocks
*/

/*
 * Custom class to add shadow to blocks
 * Need this until box shadow support added to Gutenberg here: https://github.com/WordPress/gutenberg/pull/43184
 */
.pixel-shadow {
    box-shadow: var(--wp--custom--shadow);
}

/* Links */
a:where(:not(.wp-element-button)) {
	text-underline-offset: .3em;
	/* text-decoration-thickness: 2px; */
}

/*
 * Form elements
 */
:is(textarea, input:not([type="submit"])) {
	color: var(--wp--preset--color--foreground);
	background-color: var(--wp--preset--color--background);
	border: 2px solid var(--wp--preset--color--primary) !important;
	outline: none;
    font-size: 0.875rem;
}
:is(textarea, input:not([type="submit"]))::placeholder {
    color: var(--wp--preset--color--foreground);
    font-weight: 300;
}
.wp-block-search :is(textarea, input:not([type="submit"])) {
    box-shadow: var(--wp--custom--shadow);
    margin-right: var(--wp--preset--spacing--20);
}
input[type="checkbox"] {
    appearance: none;
    min-width: 0.75rem;
    height: 0.75rem;
    position: relative;
    margin-left: 0;
}
input[type="checkbox"]:checked::after	{
	background-color: var(--wp--preset--color--foreground);
    content: "";
    position: absolute;
    width: 75%;
    height: 75%;
    top: 0;
    left: 0;
	bottom: 0;
	right: 0;
	margin: auto; 
}

/*
 * Navigation styles
 */
.wp-block-navigation__responsive-container.is-menu-open .wp-block-navigation__responsive-container-content .wp-block-navigation__submenu-container {
    padding-top: 0.25rem;
    padding-bottom: 0.25rem;
}
.wp-block-navigation__responsive-container .wp-block-navigation__responsive-container-content .wp-block-navigation__submenu-container {
    background-color: var(--wp--preset--color--background);
    color: var(--wp--preset--color--foreground);
    border-color: var(--wp--preset--color--primary);
}

.wp-block-pullquote cite {
	font-size: 0.75rem;
	font-style: normal;
	font-weight: 300;
	line-height: 1.6;
}

/* Necessary so the header containing the navigation fills the entire remaining horizontal space, since it is positioned in a flex group with the site logo. */
.pixel-header {
    flex-grow: 1;
}