cange color for amp

/* change the hexa code you want */

add_action( 'amp_post_template_css', function() {
    ?>
    .amp-wp-article .amp-wp-breadcrumb #breadcrumbs .breadcrumb_last_link a { color : ##53585c ; }
    .amp-wp-meta .amp-wp-byline .amp-wp-author, .amp-wp-meta .amp-wp-byline .amp-wp-author a {color : ##53585c ;}
    .amp-wp-meta .amp-wp-posted-on {color : ##53585c ;}
    <?php
} );