dkpdf_before_content-dkpdf_after_content.php

<?php
function custom_dkpdf_before_content() {
	$output = '<div style="margin-bottom:25px;width:100%;background:#CCC;">Before content text</div>';
	return $output;
}
add_filter( 'dkpdf_before_content', 'custom_dkpdf_before_content' );

function custom_dkpdf_after_content() {
	$output = '<div style="margin-top:25px;width:100%;background:#CCC;">After content text</div>';
	return $output;
}
add_filter( 'dkpdf_after_content', 'custom_dkpdf_after_content' );