Display Your Logo rather than blog name on the AMP Pages

function.php

<?php
// Do not copy the above php tag in your function.php
/**
 * Change blog name to a blog logo on the AMP Page Header
 *
 * Add this to your function.php
 *
 * @author  MetaBlogue
 * @license GPL-2.0+
 * @link    https://metablogue.com/configure-enable-amp-wordpress/ 
 */
add_action( 'amp_post_template_css', 'mb_amp_header_css_styles' );
function mb_amp_header_css_styles( $amp_template ) {
	// only CSS here please...
	?>
	header.amp-wp-header {
		background: #F6E3CE;
	}
	header.amp-wp-header a {
		background-image: url( 'https://example.com/wp-content/uploads/2017/09/example-header-image.png' );
		background-repeat: no-repeat;
		background-size: contain;
		display: block;
		height: 60px;
		width: 165px;
		margin: 0 auto;
		text-indent: -9999px;
	}
	<?php