Code for Styling AMP Header Bar and Text

gistfile1.txt

<?php
/*
 * Custom CSS for AMP
 */
add_action( 'amp_post_template_css', 'xyz_amp_my_additional_css_styles' );
 
function xyz_amp_my_additional_css_styles( $amp_template ) {
    // only CSS here please...
    ?>
    nav.amp-wp-title-bar{
        background: #f0f0f0 url(/*link to your bg image if applicable*/);
    }
    nav.amp-wp-title-bar a{
        color: #cc4125;
        font-weight: bold;
        font-size: 22px;
    }
    .social-sharing a{
        padding-right: 10px;
    }
    <?php
}?>