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wp-content/themes/twentytwentyone/classes/class-twenty-twenty-one-customize-notice-control.php

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+<?php
+/**
+ * Customize API: Twenty_Twenty_One_Customize_Notice_Control class
+ *
+ * @package WordPress
+ * @subpackage Twenty_Twenty_One
+ * @since 1.0.0
+ */
+
+/**
+ * Customize Notice Control class.
+ *
+ * @since 1.0.0
+ *
+ * @see WP_Customize_Control
+ */
+class Twenty_Twenty_One_Customize_Notice_Control extends WP_Customize_Control {
+	/**
+	 * The control type.
+	 *
+	 * @since 1.0.0
+	 *
+	 * @var string
+	 */
+	public $type = 'twenty-twenty-one-notice';
+
+	/**
+	 * Renders the control content.
+	 *
+	 * This simply prints the notice we need.
+	 *
+	 * @access public
+	 *
+	 * @since 1.0.0
+	 *
+	 * @return void
+	 */
+	public function render_content() {
+		?>
+		<div class="notice notice-warning">
+			<p><?php esc_html_e( 'To access the Dark Mode settings, select a light background color.', 'twentytwentyone' ); ?></p>
+			<p><a href="https://wordpress.org/support/article/twenty-twenty-one/">
+				<?php esc_html_e( 'Learn more about Dark Mode.', 'twentytwentyone' ); ?>
+			</a></p>
+		</div>
+		<?php
+	}
+}