Header and link color

Hello,

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This is a common problem. Doesn’t work on 3 sites with different theme templates, including WordPress.com
screenshot

Thank you for reporting we are investigating more on this issue.

You can add custom CSS to reader mode leagacy themes by adding the following code to your theme’s function.php or in a custom plugin, you can also follow this guide for additional information on customizing the reader mode legacy theme.

add_action(
	'amp_post_template_css',
	function() {
		// only CSS here please...
		?>
		a,
		a:visited,
		.amp-wp-comments-link a
		{
			color:#000;
		}
		<?php
	}
);

alternately, you can choose a different theme as a reader theme or add a child theme as a reader theme, our guide has more info it.