Custom CSS in reader mode?

Hello! You can add custom CSS in Reader mode by adding the following code your theme’s functions.php or a custom plugin:

add_action( 'amp_post_template_css', function() {
	?>
	/* Put Custom CSS here */
	<?php
} );

AMP allows most CSS, but there are a couple restrictions: https://amp.dev/documentation/guides-and-tutorials/develop/style_and_layout/style_pages

Be sure you don’t add so much CSS that it goes over the 50KB limit.

Thanks Weston. That’s perfect.