Header and link color

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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.